750 Edelbrock issue

What I've found so far is a gunned up 750 carb, fouled plugs. I picked up another set of plugs, installed my 600 Holley. I believe it's a 1460, the one with vac secondary and a metering plate on the secondary side. It's a common carb. I was able to check and a just timing at 12btdc, set idle at 850, with 16 in of vacuum. Now I am wondering if the 750 can be saved...I am going to open it up and take a look. The Holley is nice, it seems like better throttle response at idle, more responsive.