My boat originally had a 1994 2 barrel non-vortec engine installed. A few years ago the previous owner sucked some seaweed around the water intake and overheated/ruined the engine. They had a Jasper rebuild installed, which I believe they bought as a short block and installed the original manifolds, intake, carb, etc. I'm considering a 4 barrel conversion, but I would like to know if there is a way to tell by a casting number or something on the block/heads that would indicate what was installed.I'm hoping the rebuild was a newer setup which would have had the vortec heads installed so I could make the most of a 4 Barrel swap.