Likely 383 swap-parts advice requested

Ok, so I've got some ideas in regard to how I'd like to fill up the block...how about water pump housing? The seller tells me that the block might not have the "right" housing on it now. My guess is he means it faces the driver side. This would be a relatively easy fix I would imagine...just get a different (a) radiator, or (b)water pump housing

I'm pretty much sold on the Schumacher mount/header setup, so no real qualms there...

I'd like to retain a/c since the recipient vehicle will have the pieces for it. Any roadblocks you guys can think of, or suggestions you may have?