So I picked up a 455 block to replace the 350 that came out of my 1972 Lemans sport. I took the block to a machine shop to have it checked out. I went back a month later (today)to drop off some other parts and he asked where the main caps were. When I told him it didn't come with any he told me it was a major problem and that the block would cost more than it was worth to find new caps and machine because the caps were made specifically for that block. He recomended I find a new block. He said i had payed way too much and i should be able to find a good 455 block for $350-$400.00 he also new a guy who might be able to help me find one. Other than the caps he said the block was in great shape. So my question is do you guys think he's telling me straight? Should I scrap the block and look for a new one with caps or try and find a set of caps that are close and machine them? Thomas.