I mean the stock Q4 intake. That "hump" on the left inner fender may get in the way. If the stock Q4 setup will fit with at least 1/2" of clearance WITHOUT removing that hump I'd sure like to know! That would make it a good swap candidate for that body. Right now the only thing that will fit without modifying the body is a Ford 200/250 six, the one with the intake cast onto the head. At least the 80s 250 uses an SBF bell bolt pattern, opening up some transmission possibilities. The 200 isn't really much more (if any) power than the old 196, though parts availability is much better.
chevsen -- the 58-63 American and all other pre 63 AMC/Rambler/Nash cars don't have the engine mounted to the suspension cross member. They use the old four point mount system with two on the front of the engine and two on the bell housing, with no trans support -- it just hangs off the bell. All others used a similar mounting system in the early 50s. You'd think the trans would need something under it, especially the very heavy early automatics like the Hydramatic and Borg-Warners (cast iron main bodies!!), but they didn't. Of course some of the bells were cast iron too -- probably had to be to support that weight! 56-62 big Ramblers actually have a suspension crossmember strong enough to support an engine if desired, but the pre 64 Americans don't -- they just have a stamped steel brace that helps steady the suspension.