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.net
2011 Infiniti M37x
2004 Taurus SEL, Ingalls tubular control arms
2003 Mercury Marauder, 4.10s, Heinous billet rear control arms, SCT Advantage III tuner
1999 Chevy C1500, new 5.7 Vortec, 4" lift spindles, EFILive V2 tuner
1986 Porsche 928S, 5.0 32v V8, 18" 993 turbo wheels
1985 BMW 745i Turbo, Euro model import, 18" 645ci wheels