OK, so a no-go on the later adapter. Is there a paper gasket between the block and the bypass? I show a GM gasket #5573980. When I google it some show a flat paper gasket and some show a square oil filter type gasket. He just bought the car and is trying to sort a few things out and I'm not familiar with the older blocks. The numbers you listed are to eliminate the original bypass adapter? Sorry for the dumb questions.
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70 Chevelle Vert L34 M21 28-A 791
70 Chevelle Cpe LS6 M40 14-14 756
70 Chevelle Cpe L?? M?? 926-99616 755
69 Chevelle Cpe L78 M21 71-B 756
70 Chevelle Cpe L34 M20 48-48 796
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