Limits of an Edelbrock performer and 1405 600cfm carb

I ran a 223/110/.549 lift cam for a couple of years in a DD, at 10.7Scr(aluminum heads),in my 367. It was an awesome DD cam. With double O/D and a Holly 600, I was able to easily take it into the low 30 mpgsUS. And fry the tires, as a 2bbl. And went 12.9/106, the only one run I ever made; allbeit with a 750DP.