[olddog]

What I would tell you is that the hp peaks when the torque starts to drop off faster than the rpm is going up. Your torque starts dropping off around 4500 rpm. The torque is dropping off because the air flow through the engine is not able to increase at a 1:1 ratio with the rpms. In other words, the engine is not able to breath as well above 4500. If your torque would stay flat to 5252 rpm then the tq = hp.

Generally if you open the ports, or increase the durration on the cam, you will get better torque at higher rpm, but you will most likely loose tq at lower to mid rpms.

My guess is the intake, mass air, or throttle body is limiting your engine. If not on the intake side, I would look at the exhaust side next.

Honestly the 347 stroker is not an engine that will live a long life at high rpms IMO. I would be happy with what you have. I like the flat tq in the low to mid rpm. Great for the street.