I have the 650 dp on mine too, I recently did a efi to carburetor swap and I like it more than I did the efi. If I could just get it tuned right it would be even better. I have a large cam and the carburetor does not like it very much and I get run on after it shuts off and sometimes it backfires. I read at Holley’s site that all I have to do is drill a small (3/32") hole in the throttle blades and turn the idle back and it should fix this problem.
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James Cox
nochevy@hotmail.com
1991 Mustang LX
12.565 @109.38mph 1.764 60ft