Tom, I've got a 91 LT5 motor just waiting for your teaking for my first "real" project. It already sports LPE heads, intake and the larger throttle body. I'll be following your progress on the 91 Z you are working on now.
I',m not dropping into a vette so space won't be a problem.
I picked up a 6 stage weiss dry sump with the same specs as the ZR1 oil pump and am concidering running that too. Did you guys ever consider a dry sump system for the 91 or is space a limiting factor? it doesn't look that difficult to integrate once teh oil pump internals are removed so teh feed line to teh stock pick up location in the block still gets oil to that beautiful crank first.