So I've got a 1990 Chevy C1500 (long bed, woo!) with a 4.3 in it. I'd like to swap over to a 350, but I'm not sure what I will need for the swap. If I'm not mistaken, I have the TH350 tranny, so that bolts up (right?). But what do I need from the 350? Do I need a whole long block, or can I mix and match some things from the 4.3? Any help in the swap would be appreciated.