What closed chamber heads are they ? Do you know the CC's of them ? My old 440 combo was a basic build. It had iron 906 heads with 10.0 comp using KB pistons. Had the MP .557 cam and Isky iron ductile rockers. I had the Holley Street Dominator but the RPM is a good intake if it will fit under your hood. Used an 850 Holley DP and Hedman 1-3/4 headers. Converter was a Dynamic 9.5 that would flash about 4200 and it had 4.30's with a 30" tire. In my 3700 lb 63 Sport Fury it ran a best of 11.49 @ 116 and drove super nice. It was a nice drive anywhere 11 second combo. Ron