Screw this thermoquad I've spent the last year trying to get the original Carter Thermoquad to work on the truck my Grandpa left me. Its a 69 D300 with a 440. I rebuilt the first thermoquad, then followed all the steps to get it tuned, and it just never worked right, so I bought a "new" one from Summit. Went through the same procedures to get it tuned, and its still got problems. 

So...Im putting something different on it, and would like some input. 

The original carb is 800 cfm, so I'd like something in the same neighborhood. 

Suggestions?