The intake bolt pattern is different on Apache vs Hellcat heads, and there isn't enough meat to redrill Apaches for it.

With that said, a 6.4 big gas truck block is the same block as a 6.2 Hellcat. In fact, Hellcat blocks have a BGE stamp on the casting, they're just powdercoated orange.

Hellcat has a unique front cover which requires a unique oil pan. Along with this, running the Hellcat blower would require the entire cooling system for both it (reservoir, low temp radiator pump, both in line low temp radiators), and the HC runs an air/air oil cooler that is recommended to run even on Hellcrate engines.

You'd have to swap pistons and rods out for something stronger and probably lower compression...at this point you'd be better off getting a 6.2 motor and just swapping the crankshaft for a 6.4 crankshaft lol.