I have a Mild 446 10.5 CR around a 580 lift cam eddy rpm aluminum heads roller rockers weiand high rise intake don't know exact model looks like a torker II hooker competition headers h pipe 2.5 inch exhaust 727 trans RMVB 3000-3500 Stall. Currently running a Holley Classic 750 DP and just dont feel it reacts as I would like setup is in my 70 roadrunner street car any recommendations as to a carb setup considering another holley or a demon havent had the best luck with eddy carbs in the past. Thanks

I think that you should go with a 800-950 but with the low comp ratio I fell that you might be over cammed Id go with the 509 or a 528 and get some good gears .

At least 850 cfm type. Try a 850 DP.

Holley 750HP w/vac secondary.

Plus you get a Holley blue pump for $25...

http://www.summitracing.com/parts/HLY-0-82750/

850HP annular, or a 950HP.

I use a Holley 850 DP on my 446 that has 10.0 comp. It has 906 heads I ported and the MP .557 cam. I use a Dynamic 9.5 converter that drives like a normal car but flashes about 4200 at the track. My 63 is a 99% street car that I drive alot and drive to the track 2 or 3 times a year. I love how well the 850 DP works for me and I only did a few minor mods. I have it jetted at 78's and 86's with 3.5 front power valve. I drilled the front squirter's to 32 and I removed the choke blade. Thats all I did and my 3700 lb 63 with its 906 headed 440 runs mid 11's with a 1.59 sixty. No stumble at all. Ron

Before you start swapping carbs (or other parts), make sure what you have is working / tuned correctly.

I'll stop my tuning rant now because if i get started, I may not get any sleep!