"Lee, I also have a 350 Chevy
"Lee, I also have a 350 Chevy in my boat (ex-AQ311) with a 4-barrel Holley, and I am happy with the arrangement. Fuel injection may be more efficient, but is not as foolproof and easy to troubleshoot as a carbed system; and that can make a big difference if you have problems a few miles away from port. If you are interested, you may want to have a look at the Seloc manual for 1992-2003 engines, as it has a good description of the fuel injection system components. But whichever way you go (carbed or FI) I would definitely install a closed cooling system.
Chevy 350 engines come with two different flywheel sizes: 12-3/4" and 14". In short, an engine with a 14" flywheel will not fit in the old bellhousing style for the 12-3/4" flysheel, as there will be no room to install the starter.
And no, you won't have to install a fuel pump inside the fuel tank.."