1966 Marlin putting in 360 3rd gen amc need some a

I actually have an inline 6 currently with an automatic. I really want to keep the torque tube in place and I really want to keep it an automatic. If I could find a 327 that's not an arm and a leg that would be awesome. You wouldnt still have that 401 wouod you? I really appreciate yours and everyone's help.

Here's a pic of the underside of a '67 Marlin showing the trailing arm mounting on the unibody frame rails for the lower trailing arms. The upper trailing arms are bolted to bosses that are one each frame rail with 2 bolts as you can see in the pic, although the upper trailing arm crossmember has been removed. The frame rails in a '66 are nearly identical and the mounting brackets can be removed from the '67 and placed on the '66. The spring cups on a '67 reside in the same location on a '66 so you can use the spring mounts on the '67-later Intermediate car AMC 20 rear that has the trailing arm mounts and spring perches built into it.

I've got two iron trans for the taking.

Getting them to NC might be an issue too.  Murphy is about 120 miles north of Atlanta (GA), 92 miles east of Chattanooga (TN), 110-120 miles west of Asheville (NC) and Greenville (SC). Thanks so much for putting your city and state in your info Chopshop! Helps a lot...

Ya know, you can hop up that six and have a unique ride. Isky 256 Supercam, Offy DP intake, 390-500 cfm 4V, and a 4.0L head and factory (or Borla, etc.) header. Or go fancy and find a three side draft Weber intake.

The M-3x trans (probably a 36 or 37) won't stand up to a 287/327 for long, won't bolt up anyway. You could use an AMC Gen1 M-8 bell and bolt the M-3x to it, but not sure what torque converter you'd use. Again, it wouldn't hold up to much abuse, but would pass for easy cruising.  The hopped up six will be significantly more power than stock, but shouldn't overtax the aluminum trans, not if it's in real good condition.

Sounds like the adjustment of the linkage and maybe the neutral safety switch is off.