You can also buy "locking" header bolts that don't need to be re-tightened at basically every oil change (i had to do that with my '84), which i'm going to buy when exhaust goes on the GT. Gaskets will usually blow if the headers aren't torqued evenly or sometimes the headers just warp which will blow the gasket. Your best bet is to get Mac headers, which don't have a single flange connecting all the primaries and having locking header bolts and i believe that will reduce the chances of the gasket being blown out, as long as you torque them correctly/evenly the first time. Good luck,
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