351 cleveland power estimate

You need the lift at the valve and duration figures. The numbers you posted are the date codes for the heads. If they are truly 4bbl heads, they should have a "4" cast into one corner next to the valve cover. The date code says they're early 70 heads ( 9M is December 69, making them 70 model year heads) Another variation is the pistons, do you happen to know if they're flat tops or domed ? If they're flat tops and the heads are quench chambered, your comp ratio is going to be around 11 to 1. Domes increase this to 12-something to 1. At any rate, do NOT fill the fuel tank with anything less than 89 octane gas preferably fill it with 92-93 octane premium. Put 87 regular in there and you're going to be extremely unhappy with the results.

That cam's pretty much like an RV or CJ grind.Sounds like the Summit grind I tried in a stock 400M a couple years ago. Made good power with it and a 500 cfm holley 2 bbl. Ought to work well with the 4 bbl heads in keeping the power band down where you need it on the street. Hp? I'd guess around 350, give or take 20-30.