273 copper head gaskets SCE

We did a clone 66 D Dart 273 and did the max weight reduction. In a Burgundy 1965 Dart GT everyone thought it was a 340. A racer Brown cam, 780 CFM Holley, fenderwell headers and a 4 speed.
65 dart GT . I had one it was a convertible I installed a Mopar crate motor 360 Magnum 402 stroker in it ran 11 5 all day long on motor