Along with "put an LS in it" is "put a Mustang II front end in it". I'm an AMC (early 60s Rambler in particular) fan. and people don't understand trunnion front ends. Most have dealings with the 64-69 rubber bushed trunnions as used in the American/Javelin/AMX of those years, which are a bit harder to deal with than the earlier varieties. They aren't ball joints, so they must go! Most of the cars have been badly used and abused, and 50 year old parts need replacing, and AMC/Rambler parts aren't available just anywhere (there are 5-6 specialty vendors that have most anything, at least mechanical). Trunnions are a bit costly now due to the low numbers sold, not because they are "bad". It's still cheaper to rebuild the existing suspension rather than remove it and replace with a Mustang II, and in some cases you have a better overall suspension. The 64-69 (actually 62-69 in the big cars) uses a lower ball joint and strut rod, very similar to the Mustang II, so you're only replacing the upper trunnion! I've heard "better choice of springs", but Coil Spring Specialties will make anything you want as far as spring rate and height at a reasonable price. Hoe many times do you change out springs? "More brake options". There are three disk brake upgrade kit providers -- Willwood, Aerospace Components, and Scarebird. If drums are ok you can swap between any AMC -- they used a bolt-on spindle with the same bolt pattern since at least 1952. I've put bigger drums from a 64 Classic on a 63 American -- another 1/2" in diameter and width makes a huge difference! It's not as easy owning something that's not a popular collector car now. You have to do more research and sometimes be a little creative, and realize that some small parts and body parts will never be reproduced -- it's used or find a substitute. But it's more rewarding/fun provided you like being just a little different. So don't put an LS and Mustang II in it... at least do something a bit more creative/interesting!