Convert slant over to v8

The only real difference of consequence is the length of the coil wire (/6 and big block need the long one). You don't need to change wiring.

All mount solutions should put the engine in the stock location. Generally self-serve wrecking yard parts make the k-member and stock mounts cheaper ($20 k-member, $10/each for mounts) and buying the same parts from a fellow Mopar guy will make the conversion mounts cheaper.