I have built two root style 440's. The first one in '85 had a 6-71 Mooneyham 1 to 1 with teflon strips and two 750's and 8.5 to 1 trw's. The second was in '99 and had a BDS street blower with BDS EFI and bugcatcher injector hat.It had 7.5 to 1 wiseco's and was 10% overdriven. The carb setup with teflon stripped rotors made a lot more power. That motor had stock rods,906 heads that I ported and a purple shaft cam with stamped steel rockers. In a 4200 pound 69 Coronet 4 speed it ran 10.20 at 135 in 1985.

I said all that to say if you do an 8-71 get the rotors stripped for better clearances and sealing for more boost. The build I am contemplating now is a twin turbo setup for the streeability.

It is hard to beat the looks of a 6-71 with a bug catcher on the street. This was my '65 on the cover of Car Craft January 2000. It wasn't as fast as my first but was way better looking imo.Lost it in a divorce