It is really hard to tell without knowing the flow numbers of the heads. "Ported" could mean so many things. Also, what transmission are you running? Your transmission will have a lot to do with rwhp. You might make 400 bhp with that motor, so, with a manual tranny subtract 15%-18% of the hp for your rwhp and with an automatic subtract 20%-25% and you will have some idea of what you will make. Nice build for the most part but it is really hard to say without knowing the head flow numbers.

 

You would probably make about 280 rwhp with the combo. Even ported the heads just don't flow enough for the cubic inches. They would be good on a 289 or 302. with that camshaft. The intake isn't the restriction so much as the exhaust is. They only have so much capability.