One thing that has me confused is the block casting number. It appears to be 86138. Wallace Racing says a 67 WS engine should have a casting number of 9786133. If I assume the first 2 digits (97) were drilled out for the plug then it would read 9786138. I guess the last digit is actually a 3? It sure looks like an 8 to me but I can’t find anything online for 9786138. Everything I find is 9786133 which is a 1967 400 HO.
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