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Re: 71 4x4 BBC Swap: Doing what I should have done the first time!
The one thing I have learned about headers if the flange shape doesn't match the exhaust port then it will be more prone to leak. Your heads have square cylinder head ports. I would recommend your headers have square openings at the flange instead of round. According to Summit Racing the 2457HKR have round cylinder head ports. I most had to go with square for sure, because my heads were ported and polished. I hope this helps and isn't confusing. We might was to ask about the square vs. round ports to get further clarification.
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