I am in search of good rebuildable engine cores. 880 and 638 GM 350 blocks with fuel pump provisions, and roller cam capable preferred. Also need a few 96-up roller cam 305 blocks. Complete long blocks, short blocks, or just bare blocks are fine. Also looking for good rebuildable 3.0 Marine or Industrial engines and a few 4.3 GM V6's. Must be rebuildable, if they are cracked, spun main bearings, or rusted beyond recognition not acceptable.