71 Z code resolution

Long time member and lurker here.  I should probably introduce myself  and share a little background. I'm Guy I grew up in CA, but now I live in Northern UT. I was minted in 70. My grandad bought a 71 Z-code car in 71. They drove the piss out of it. It was gifted to me in 87 as a reward for driving a year without any moving violations... The hiccup was the grandparents let mom and dad borrow it in the 85-86 time frame (they were down a car). Mom came home one day it backfired and poof engine bay fire... The long and short is I never got to really enjoy it for a pile of reasons. FFWD to NOW, 30 years of marriage 5 kids raised and out. My resolution is to get it running and driving by this time 2021. The fmx trans is toast with no way to rebuild it(or anyone that will) the motor was properly rebuilt 10 years back and I have a narragansett reproductions harness complete with thr proper terminals. I also have a torqueflight from a 73 or 4 AMX. Now to the discussion points

1. I have the crank mod drawings, I need to pull the crank and have it machined to play nice with the TQF. Anyone here have experience with this?
2. I really want to get this thing performing like I remember as a 12 year old. What do I need to keep in mind when building the trans?
3. What should I do about picking the correct torque converter? The car was able to break traction in every gear (according to both of my uncles... and my grandmother.....)
4. It didn't have posi.. I have a rear-end from that same 73-74 amx... Was it twin grip or not, what should I be looking for and thinking about?
5. If I remember correctly it was barely tame enough to be a daily driver what gremlins(no pun here) are lurking to prevent me from getting back to this state? 

Edited by scott - Jan/30/2020 at 3:34pm

Trans should be a borg warner model 12 not a fmx. Similar but not the same. I have rebuilt them, not that complicated. It may or may not be a thing for you but I would keep it original. If you really want a 727 I would find a 72 and newer crank and tear down motor and have it balanced for the new crank. If you go the 727 route most anybody can rebuild one. Good luck with your project. You should come to colorado springs for the amo national show. If you come to the show I can hav e a 727 waiting for you.

scott wrote: Here's where to send your valve for repair http://www.heatercontrolvalve.com/ I'd keep looking for someone to rebuild the M12 automatic before I would pull the engine apart to do a Torqueflite swap. There are people & places that will do them, I suggest you post in the transmission section looking for advice. The only gremlins lurking that will keep it from being a smooth running daily driver is your ability to tune it. Keep the engine stock, or close to stock. Just easier that way. Set up correctly, it should idle like a dream all day long, & smoke the tires at will, especially if you keep the single leg rear axle. You have to investigate the 73-74 rear axle to see if it is Twin Grip. Turn the input yoke, see if both wheels turn the same direction. If they don't, it is an open rear end. If they do, it may be Twin Grip. Pop the rear cover off, take a look inside, & post a picture. Then we can visually confirm it is Twin Grip. I've owned a 1971 401 auto Javelin AMX since 1986. Best of luck with your project!! Start a build thread in the projects section so we can follow along & encourage you. Post lots of pictures!

I've been looking for my cam data... No luck yet I just remember being told the lift and duration approximated an rv grind and its a crower. The pistons are speed pro L2380F .040 the motor was fully and properly machined and balanced and has less than 100 miles on it (trans and electrical issues) but that was 10 years ago so.... you know how that goes.