I am running the largest comp marine roller cam in my 79 with 10:1 compression and world sportsman II heads. I would not worry what name is on the cam (marine, 4x4, etc) that's just a recommendation. In my case the XM276HR is the same grind as the XR276HR car cam, but on a 112 LSA instead of a 110 LSA. I wanted the wider LSA for a slightly better idle for EFI friendliness.
Steven H. www.carfap.com
2011 Infiniti M37X, 2004 Ford F250 6.8 V10 6 speed manual 4x4, 2000 BMW M5, 1999 C1500, 1994 Town Car, 1976 Jeep DJ5