Flywheel will depend on engine balance.
The Mark IV 454 had an offset weight on the flywheel/flexplate. I do not know how much weight, or where it's positioned.
The Gen 5/6 454s also have offset weight on the flywheel/flexplate, and forged-crank engines have different weight than the cast-crank engines. I do not know if either one is the same weight/position as a Mark IV.
It's unlikely that your engine is internally-balanced via an aftermarket balance shop, requiring a neutral-balanced flywheel. So you "probably" need a Mark IV 454 flywheel, but maybe not if the one you have is balanced the same as a Mark IV.
The clutch/pressure plate/throwout bearing would be whatever fits the transmission and the truck's clutch release system.