I used a set of napa ultra seal header gasket and the high temp copper rtv
on both sides of gasket and letting it hang on a wire for 15 mins to cure some
instaled the gasket and header bolts just snuged up some,let sit over night,torqued the bolts down tight by hand
no leaks for about 3 yrs till I pulled the engine
this was a used set of headers and pitted on the flange and warped some
I used a flat file and smoothed the flange flat around the port
68 Dart 318 A body 73 k-frame...
I know what ya mean on tight fit and header leaks
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I also removed the studs in the heads for ease of installation
good luck
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