strength difference 1969 1970 & 1971 - 1974 351w blocks
I have been serching and reading a lot of info on the strength of the 351 block. I know that the 69 & 70 block have a 9.480 deck height and are the strongest and the 71-74 blocks have the 9.5 deck heigth and are stronger then anythig newer. My question is how much stronger is the 69&70 then the 71-74? Is it worth dealing with the shorter deck (maybe having to mill the pistons) and getting a 69 or 70 or should I just get a 71-74? I am planing on building a 408 for my 91 coupe that will be a street strip car that I want to see put down about 500-550hp to the wheels. Thanks for your help.
My daily driver, 91 Bimini Blue Coupe, Tokico blues, Steeda sport spring, MM frame connectors, J&M lower control arms, MM panhard bar, shorty headers, o/r h pipe, 3.73 gears, 31 spline torsen and Optima red top in the trunk. 5 lug & cobra brake swap with 18 wheels.