Holley Question.

This is a question about a 600CFM Holley 4150 with vacuum secondaries. I have a Camaro with a 350 pushing about 10:1 compression, a dual plane manifold, a new crane cam, a 2500+ stall converter, redone TH350 tranny with a shift kit, and 3.73:1 rear end ratio. I was wondering what spring color I should use for the secondaries? I currently have the purple spring in there, but I have been using that same spring since I had the low compression heads, old cam, and 2.73 gears in the back. Now that I have the low rear end gears could I go all the way up to a white spring, the short yellow spring, or the long yellow spring? Any other info that I should know about the carb would be useful too. I know my way around carbs. I was just curious if I could get more ball park before having to go through all the different settings and having to go drive the car to see the results.

Have no idea about yours, but if you know about Holley carbs.... Where in the hell is the "Fast Idle Screw" on the 3310-3 (4150/4160?).

Nevermind. I tested it today. The white spring will go in tomorrow.