The answer for me, on a 327F motor, was a new 600 CFM marine Edelbrock. It bolted right on and ran great right from the start.
Below, is a photo of the new Edelbrock along side an old speedboat carb I pulled off another boat just to do some testing. It ran “ok” but the new carb was clearly superior.
It’s a pretty simple bolt on application too. Here is an iron intake manifold on the 327 motor, ready to receive a new gasket and carb.
A special banjo fitting from Edelbrock made hooking the fuel line up a snap.
Snugged up the carb body to the gasket, again, pretty simple.
Linkage adjustment was a little involved but worked fine without needing any new parts. The tricky part was the fact that on this particular boat, the single lever controlled the throttles and the transmission
