What's the bottleneck in my engine?

[Cracker]

I'd also agree with Pat regarding the #'s. Your cam (to me) looks fairly mild and with your peak hp @5,700 represents your go-fast parts are a waste - to an extent. That figure represents most stock redline figures in which case all the forged goodies are nullified. My similiar CI motor (427 BB) has similiar components and runs 11:1 with a .600 solid cam (edge of streetability) and makes peak HP at 6,300 but sings to 7,200 without complaining. It was built as to all out race motor standards without the compression (gas) and cam (streetable) but all other components allow it to explore the 7,000 rpm range safely. I would HOPE the benefit of a SB motor is to do the same as it appears your components would withstand the abuse. I'd say convert to solids (if possible) and take advantage of your intake/carb/internals, etc. and get it to REV. Based on where your engine is now now you should have just selected a low reving BB power plant. Best wishes!