My plans, your thoughts

The a body platform has more "stuff" involved than a b body. Your k frame is doesnt have to be touched/notched/kissed/loved etc. for the 5.7,6.1, or 6.4 to drop in. You need TTI mounts, Shumacher poly locs (better than the oe style rubber) and 3g hemi drops right in. You can use a factory 4spd, (the engine accepts all small block trans.), but if ya go with an tremec, or the like, some tunnel mods are required, some just may need the BFH, while others need to break out the cut off wheel. Call the aftermarket suppliers for whatever trans you want and ask what is required to mount their trans. Once tou have the engine/trans together they wiil drop in with no issues. Headers, TTI cause they fit but pricey, hotwireauto.com for the harness, use an 05 truck computer, have hotwireauto program the computer. This will keep you with factory parts and your set. Fuel system...tanksinc.com for an intank set up that is around 250ish. I personally have done everything listed here, exception, I used a 545rfe trans and did have to modify the trans tunnel, but it was worth it. Check fbbo, latemodel hemi into early b bodies, this may give ya an idea of what's involved.http://www.forbbodiesonly.com/moparforum/showthread.php?1618-late-model-hemi-into-early-b-bodies