Since you should have the desirable oval port castings on that core engine, my advice would be to do a mild rework of those castings. You won;t have much money in them, and, do not underestimate their potential. If you sneeze on them, they flow over 300 cfm on the intake. Put a 2.19 intake, and do a deep pocket port, and deep port match on the intake, remove the big rocker stuff bump on the intake, and they flow 315+. For what your doing, I can almost gaurentee you will run faster with them. Those heads just work. With extensive work, I have made nearly 800hp with a set of 049's, on a not even close to maxed out, very basic 496. Recently did a regualr hydraulic flat tappet 496 10:1 pump gas street engine, that made 622hp, and 605 ft/lbs, with a nicely done up, but not radical set of 781's. They work.
Frank
Advanced Performance
www.get-ap.com