Looking for advice/tips

So I'm looking for some advice on my set up and my launch.

I'll ask about the launch first. I'm running cal tracs on my 383 powered dart and just using a 2-step to launch. In my research about launching, most people say to go just off idle, what do you mean by that, are we talking like 1,000 1,200 rpm or like 1,800-2,200 rpm? I idle my car around 1,000 rpm.

Next is a bit more of a technical question. As stated before I have a 383 in my car and I currently have a performer rpm intake on it, which is a dual plane, would I see much benefit going to a M1 single plane?

The specs on the motor; 383 punched .030 over, stock bottom end, Indy 440ez heads with no porting, and the cam is a comp solid roller .576/.582 lift at 248/254 at .050 (here's the specs Xtreme Energy 248/254 Solid Roller Cam (3 Bolt) for Chrysler 383-440)

The car is a dedicated race car with 4.30 gear so no worries about street manners