Oil pressure, oil filter, oil problems?

The covers are the same. Like SC397 I'm pretty sure the only difference is the double ended threaded filter fitting. Even if it's not, the angled oil filter adapter/pump cover will fit all. I don't know if the new timing cover comes with the adapter/cover, but I'd think so. It's possible that the machined surface where the filter fits is different between filter styles -- different diameter or passages -- but not likely. I'm looking at the 67 TSM as I type -- I'm more of a six man myself, been a while since I built an AMC V-8, and I haven't had to change timing covers on one, all I've built checked out good. 

Rick has the experience with the V-8s to recommend what to do about the oil pump -- I don't. Wix has always been one of the best filters, and I think the NAPA Gold is sourced from Wix.

I can tell you that I like the Lucas oil stabilizer. It will help a little, and will quiet gears. I run half a quart every other oil change in my 1980 GS1000 bike (engine and trans share oil) and if I skip to three changes I can tell the difference in gear noise in the trans (well, it has 90-100K on it...). You can run up to a quart in an automatic transmission (if it holds at least 10 quarts total... 10-15% Lucas) and it will firm the shifting up just enough to notice without doing any damage. I ran it for years in a little M-35 air cooled trans in a 63 American with a hopped up 196 OHV (160-170 hp). I ran the axle in my current ride low in oil (darn pinion seal leak!!) and burned the gears just enough for them to make a little noise. Not much, but enough to notice in the station wagon. Wouldn't be near as bad in a sedan, but with the passenger compartment extending over the axle all the noise comes right in. I don't expect the Lucas to cut it out, but should make a noticeable difference... I hope.  Lucas says you can run it 100% in a differential, but I tried that once and it made more noise. No more than 50%, and I think 25-30% will be better. I drained the 100% and mixed it, don't recall what mix I used though. I'm going to go with 30-33% in the noisy one and see what happens, after I replace the seal.