15dia 22 pitch 4 blade /1:50 but it will do the same with a 13.750 23 3 blade.

15" diameter is a lot to swing for a small block, even with a blower. I'd try a 21" or smaller 3 blade or a 20" or smaller 4 blade.

Having #80 jets squared with no PV in the secondaries makes no sense. If its rich with 90's in the secondaries, then the primaries must be rich with 80's.
You probably need something more like 74's and 84's.

With todays clean burning fuels, the porcelain on the plugs should be almost completely white. Too read the plugs, you need to look at the base circle coloring.

thanks griff ill give that a try this weekend and see what happens

I wouldnt run any supercharged boat without a wideband a/f and a fuel pressure gauge,, otherwise you are playing russian roulette with your engine

fixx
 

does not matter what the plugs look like,,the boost will blow the spark out after a certain amount of rpm,,i have seen this before,,the boat will still run but it wont have enough spark to ignite all the fuel and will smell rich when it blows all the unburned fuel out the exhaust..4000 rpm is usually the magic #..

Good point, what ignition system? Plug gap?

fixx
 

dont know if its the same gut i talked to a few weeks ago but he said he had the plugs at .040..

What Ignition? Stock HEI? Might need an ignition upgrade, cam appears on the small side, which would explain a lot, but definately throw a WB O2 on 'er, and keep that thing rich or you're going to be melting pistons...

How does she act when the power falls off? Any breaking up or misfiring? Or just feels soft when the power builds? Could be spark or fuel, double check both before changing anything internal...

I agree with staying Hyd Roller, but not sure if the hot cam is the best choice with boost.... If everything else checks out (spark, air, fuel) add more cam...

Good luck...

thunderbolt IV ignition plugs gaped at 035