Carb & Heads. 625cfm just ain't gonna cut it. Look for a 650 D/P Holley, probably a 750. Then get some good heads, your sig doesn't say what kind they are so I ASSUME your're talking E7's You can get a set of Dart Windsor Sr. heads on the cheap on ebay (Sold my complete, ready to go for $700) 2.02 intake, 1.60 exhaust would do it for now.
Just my .02! Just for the record, it's still shytty here in Ohio. I'm jealous of you guys that are racing already!
