First make sure the motor is at the right height. Too low and it plows, too high and it ventilates. A pontoon sure could use a powered jack plate as the prop height changes so much with load
What vintage is the Mercruiser motor?
Full system or half system?
Exhaust manifolds need to be changed to match up with the VP y-pipe
Flush your cabin heater and test it. It may have a freeze busted core
yes.
some light reading of me doing the same. some of the pics are missing because I was using webshots at the time for picture storage. later used photobucket.
https://forums.iboats.com/threads/venturing-into-performance-upgrades-for-an-aq271c.489465/
the key will be to acetone test your...
Going to do a O scale layout on a shelf around the mancave as soon as Zack moves out. N scale in the desk
Next project is a 1952 Fiat Topolino wagon with Corvette IFS/IRS custom frame, AR5 trans and a yet to be determined powerplant.
Tach connects to the coil negative post. Same tach will work with points and Delco EST
Switching from points to Delco EST, you have to bypass the resistor wire and feed the ignition system with full battery system