3 FISH LIMIT AL's BUDGET BUILD

I had a 600 cfm 1405 Edlebrock carb that came with the car parts back when I got all this stuff, was told it was on a running engine. I bought a bigger one , 750 cfm 1407 from a member here. I had the small one listed for sale, but tried it on the car the other day and it runs good. So I'm not sure which one I'm going to need so I'll keep them both for know.