Jimmy,
If I could do it over again, and face all the problems again wich a have encounterd, I should buy a LT1. I will expain why.
The '84 is a x-fire, less power and no injection, and difficult to modify.
The '85 till '87 (I think) the TPI, has bad brakes, lots of electric problems and a different chassis.
The '88 till '91 are better, but still the L98 engine and the '90 till '96 have the better ZF-6 speed gearbox. Brakes are still bad, but you can buy coilovers easy for the types after '89 and brake upgardes.
'92 you have the new interior, better engine LT1, wich has reverse cooling! More horsepower (300), and a overal better car.
'96 you can have a grand sport, wich has 330 hp and bigger rearwheels 11J, but this one is realy expencive.
In '90 till '95 you could have the ZR1, wich was a special model, twice expencive, but the engine has still to much trouble because of the worse oillines. And when something goes broke, you have to pay lost of money.
The best buy you can do, is buy a '92 LT1, you get the better engine, nice interior, easy to modify, better brakes and the new exterior. Better gearbox etc. etc. Overall you will spend some more money too have one, but at the end you saves it dubbel!
If I could do it over, I would buy a LT1.
Good luck.
86 tpi zf-6 Modified L98 270hp & 317 lb.ft Rearwheelpower