looking for some help here from the chevy guys. i recently picked up some chevy parts that were included in a garage sale. i got a chevy big block, 2 sets of heads, cast intake, cam and forged rods with some beefy looking pistons. couldnt find the crankshaft but i did get 2 transmissions that were wrapped in a blanket? (thinking they may have been rebuilt?) anyway i got some numbers from the block and 2 sets of heads and was looking here for some help of what i may have if anyone can correctly identify what i got and possibly might know what kinda car it may have been used in? 1 set of heads, (3964290,g11,gm3t,)(3964290,f24,gm4t) other set of heads,(3909802,b137,gm5t,conv4)(3909802,b77,gm6t) this set of heads have "O" around circle emblem. engine-3963512,gm4,conv2,L18-8, hi performance. intake-3856289,e205,q-jet appriciate any knowledge that can be shared.