Re: AMC 304 Info??
The 304 is a bolt in swap if you have the factory parts, most are still available new. You need to aquire the following parts (dealer or wrecking yard):
76-81 CJ right side frame bracket; rubber motor mounts; rt & lt engine to rubber mount brackets (different than pass. car or truck brackets that may have come with your engine); radiator hoses; fan shroud; recommend 7 blade factory fan and fan clutch; stock 6 cyl throttle cable is a little long but it fits ok (V-8 CJ cable is still available new last time I checked); 6 cyl trans fits perfectly including clutch and linkage, Flywheel bolts on but I'm not sure on the flywheel balance 6 cyl to 304 V-8,(360AMC is differently balanced for sure);
get 78-91 V-8 accessories and brackets from a fullsize Jeep or CJ, most are still available new but are expensive; p.s. pressure hose usually can be slightly bent to fit but it must match the style of fittings used on the pump ('76-'80 used double flare seat seals, '81 used o-ring seals); starters are the same; use '78 motorcraft type ignition system or even better the new MSD billet distributor and MSD module (50state legal); sending units fit perfectly; use AMC pass. car,truck or CJ exhaust manifolds; You won't have to change driveline lengths unless your Jeep has been butchered (ie. former chevy swap,accident damage etc.) I have converted 6 CJs to AMC v-8s and they all worked well, much easier than a chevy or ford and replacement parts are available at any parts house or dealer.