What cam & lifters did you use whas it babbit bearing 1 of the other many problems was the rear cam bearing hole was bored for a big block bearing had to sleeve down to SB
Back on track had another go at it bored the 2 stripped holes down & retapped heads torqued up OK
What head bolt kit did you use ARP has a kit marked R3/Ritter Edelbrock heads all the bolts are 1/2" instead od 1/2" & 3/8 for the inner & outer the the nuts were the large 12 Point that will not fit into the head recess looks like a guess
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