A dealer I bought Pontiac parts from had a 70 RA IV GTO ( not sure if it was as judge but silver)in for service on blown 400. They got a new SR block. Under warranty. Parts man gave me the WW block. It was given to Jim Miller for roundy round GTO. We traded parts the block was fixed. I had an SD455 block that got reunited with the original car,vin matched. You never know. Good luck.
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