You can do that, but you are going to run into a problem because with that much compression. With that much compresion, the cam small enough to work with that exhaust is not going to like the compresion.

You'll end up spending just as much money as starting from scratch. Make a deal with the guy for the parts, but make him give you the labor to change the thing around the way you need it.

Rememerb that with a cam swap comes a spring swap as well.

a 750 carb is plenty big for that engine. You can make over 600HP on a good 750 carb.

I know you want more power, but you have to plan it properly, or its no good.

Have you torn down your old engine yet?

Jeff,

Any opinion on the 496 manifold and riser? It looks like it would work a lot better due to the downturn in the riser and where the water mixes. I have read that they are close to many aftermarket manifolds... And I can get a set from a guy for $250 rather then spending 2000

They are an in expensive upgrade, but your still going to have to swap the cam and springs, and fight the comp issue.

Rememeber that you said your buddy was running 110.

Call bob madero at marine kinetics. He is a cam GURU on this forum. He'll give you better info than I can on specifics, but overall, the set up is going to suffer. I know its not what you to hear, and I'm sure you can find someone to tell you what you want to hear, but I have learned the hard way to error on the conservative side if you don't want to keep spending lots of cash.

Bobs OSO handle is RMBUILDER

Agree call Bob Madara! He designed my engine and he will design my next one! He can bleed some of the compression off with different lobe designs but I still think 10.5 is to much. When I was building my engine the max compression he wanted in my engine was 9.9:1, and I'm running aluminum heads. I hate to say this but just because something is cheap doesn't mean its a good deal! If you want Bob's number let me know.

So I called bob madera, he is going to make me a cam, I am going to use 496ho manifolds with stainless risers and keep it 10.5 to one with a mix of 116 octane race fuel and 92 pump gas to get about 95 octane. He says this will make my little formula fly.
Its going to cost a bit to mix but it will be worth it for the power, I also have a 76 station in my area that has 100 octane at the pump for about 6.50 a gallon, may try that as well.

Thanks for all the input!

Run the 100.

Good call on calling and talking to BOB. He has assisted with quite a few builds for me and he is right on every time.

Bob actually sugested Toluene but im in california and its hard to get and costs about 15 bucks a gallon!

I always forget you guys can by 100 at the pump. It is good stuff too, doesn't it still have lead in it? That is good for a performance engine.

This little bably is gonna fly with that exhaust and a Madero cam in it.

Congrats and have fun.