What engine? Any other numbers?
My Indmar 454 (suposedly 330HP @5K) came with the Chevy factory "High-Lift Hydraulic" (I'm sure because the lobe heights matched that cam's specs after I removed & calipered it although I have no way to check the duration specs). I found no markings on mine tho- at all. They had/ve a marine cam too but it wasn't mine. Without some kind of numbers, no telling what you have or from whom.
Original cam .......... hydraulic
.282" exhaust lift (at lobe)
.271 intake lift (at lobe)
.479" lift (valve) (20-68)
.461" lift (valve) (74-20)
Duration 268*in/274*ex
Chevy 3883986 High-lift Hydraulic
Used in L-71 / L-72 / L-78 / LS-5 engines