They're the same as their similar year passenger car counterparts. Any 440 72 and later is going to have low compression, 8:1 ish. They used the same heads as the cars did. I have a 77 440 in my 67 Coronet that was stock except for headers and it had decent power. I'm putting a cam in (Summitt 6401), Holley Street Dominator intake, and an Edlebrock 800 Thunder Series (same style as a Carter AVS).