If I buy a long block or short block, like a ZZ4, Fast Burn, or 350 H.O. and H.O. Deluxe, can I install the TPI setup as long as I have everything necessarry? (i.e computer, wiring harness, sensors, etc) And if I wanted to buy a long block or short block which ones would be compatiable with most of the parts and accessories off the L98? (i.e. water pump, damper, flexplate/flywheel, distributor, starter, etc)

 

The HO and Fastburn have Vortec-style intake ports. Using them will require the SDPC Vortec TPI base. If you opt for HO, your best bet is to get their TPI version, which has the base and a cam that will bring the TPI power up to the carb'd HO standard. Also requires a supporting cast, including PROM tuning.

The ZZ4 would be the most compatible for the reason stated above. All of the things you mention at the end would fit any of those engines, though.