[bwood]

How old is your "new" engine? If it is an older 2 piece rear main seal engine, you will have to get a flexplate/flywheel to match it. The engine in your 90 has a 1 piece rear main seal, the bolt circle for the flexplate/flywheel is different. You will also have to install the knock sensor in the passenger side of the block (in the block drain). The intake will fit physically, but the two mounting holes in the middle of the intake on each side have a different bolt angle. I know people put older intakes on the TBI heads by modifying the holes in question, I don't see why you couldn't go the other way. If I remember correctly, the TBI bolts in the middle are at something like 72 degrees (not sure on the angle) and the older heads are all perpendicular to the mounting surface.

And like ChevyTech said, anything too "lopey" will run poorly with the stock tune/chip.