The short block is the same as an automotive engine, but the marine version would have a different cam(and possibly a reverse rotation verion), and it would have had a cast iron intake and marine exhaust manifolds originally but these parts would have been changed to put it in a truck.
explains the high rev it tacs out on the gage a three ouaters of the way into the gas pedal at 6000 rpm s and its not even at full throttle what about the heads im going to pull it out tommorow and see what it has for heads
Look for a capital letter cast into the outside/top corner of the head near the valve cover or between the first and second bolt. GT will be GT40 heads, R will be E5TE and T will be E7TE heads. If none of these exist you'll have to pull the intake and get the casting number from the underside between the inner intake ports.
D0OE heads are the old model 351 castings, not bad if you're only planning on a valve job and cam with less than ~.45" lift. Auto engines use rail rockers, never seen one with bolt-down pushrods though. I've got to figure that's an even worse set-up for any kind of performance engine...
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