Me , went with the gm stock series II v6 or ls6 beehive. They work well with the performer cam. It is possible that the stock vortec springs would be enough for that cam you chose. Compress the springs and measure so you know what you have. Yes the stock spring will physically install in place and run the flathyd lifter engine. The pushrods and stock vortec rocker will also go in place.
Boats! If you have a tricky boat launch, with a big boat, the 3000 stall will be a little soft.
I would measure the crank , all fitting surfaces. It is probably not a big deal, and something that can work. Never looked at the marine stuff. Somebody else would know better than me.
Last edited by spinn; 03-01-2013 at 12:16 AM.