Horsepower guess?

I don't know if this will help, but I can tell you what worked for me. 1973 360 block, .060 over, speed pro h405cp60 pistons, speed pro camshaft #cl1143r, 587 heads milled .020 and gasket matched, rpm airgap intake, 750 eddie carb, with stock converter and 3.23's. Nasty idle, awesome mid range, driven every single day with 12-13 inches of vacuum and power brakes, never had brake fade at all, could leave 25 yards of rubber from a dead stop with no brakes and got 14 mpg. Good enough for me!!! This cam has alot of overlap, hence the nasty idle, but on the recommendation of some guys here I swapped it in.I was running a 272 energizer before and the car, my dart, sounded and pulled like a truck, which is not bad, but I wanted more, I wanted a fast reliable driver, and I got it! You might consider this cam. If you are anything like me, the 262 will leave you wanting more...