82-92 have 305 5.0 LG4/LB9 and 350 5.7 L98
93-97 have 350 5.7 LT1
98-02 have 346 5.7 LS1

if you are planning on going with an 82-92 the 350's had larger
intake runners and there was no factory carb'd 350s or if you're
not sure just run the vin on www.thirdgen.org