Edelbrock part #7205 Exhaust Gaskets are designed for 1965-90 Big-Block Chevy Mark IV, 396-402-427-454 V8 engines. Gasket futures a 1.940" (round) port size.
Edelbrock part #7226 Exhaust Gaskets are designed for 1958-1979 Big-Block Chrysler 361-383-400, 413-426 & 440 V8 engines. Gasket futures a 1.84"x 1.33" port size.
Edelbrock part #7227 Exhaust Gaskets are designed for 1963-1996 Small-Block Ford 289, 302, 351W & 1982-96 5.0L &5.8L 351W V8 engines. Gasket futures a 1.25"x 1.48" port size.