I am new here so I will ask a few questions now and then. My Dad and I are building a truck 409 for our 61 Belair. We had it bored.060, put in Ross 11.1 pistons, have an isky .515 lift cam, scorpions roller rockers , 348 1147 2.07 heads topped off with the stock 348 manifold from the 305hp engine and a holley 750cfm carb. My question is: How much Horsepower do you think we are putting out? Do we need to do anything different to get to 400 hp? Thanks.