My old combo was similar to yours except mine is a 451 (400. I ran 906 heads and had the Weiand TR/1850 combo, it would go 10.90's, we moved to the Mopar 590 cam and traded out the 1850's for a pair of center squirters, we went a best of 10.75 at 3300 lbs. With that combo in my car, it liked rpms. The more I would spin it the faster it would go. I'm not sure I would want to spin a stock rod/piston 440 to 6600 on a regular basis, I was probably living on borrowed time even doing it with the lighter 451/400 combo. So If I was you would I do it, ABSOLUTELY, but it make it work good you will likely need more converter.