Where did my throttle response go?

[savatreatabvr]

A while back I posted and boasted about my Quadrajet to Edelbrock 1407 swap! I said I had much better throttle response and gas mileage, after bolting down the 1407 my fan belts would actually squeal when I hit the gas, never did that with the Quadrajet, no I didn't spill gas or oil on them so I guess the power steering pump or alternator would have to catch up with the crank when revved up! That was great but after a few weeks it gradually stopped being that responsive and kinda feels like the old Quadrajet again! Any ideas why?