Scoot,
My last 2 street/strip and my last all out drag car had return lines, I seemed to have less loading up and fouling issues. 2 of my previous cars did not have return lines and I spent a lot of time pulling plugs to either clean or change them. it seems to make your fuel pump last a little longer also since the pump isnt under such a strain during low fuel consumption.
I on the other hand have pretty much given up on street/strip backhalf cars and gone back to my roots. I sold the Camaro about 10 days a ago and picked up a cream puff from a very anal car collector. 1967 Firebird 326 HO with 57000 original documented miles, its an AC car that has had one repaint in its lifetime. The whole interior is 100% original and the only changes that have been made is when it was repainted in 1985 (its looks like it was repained last week!) they removed the vinyl top and added a 400 hood. This is my keeper, I will own this one till I die or someone offers me STUPID money for it!
Oh yeah and momma is happy cause now I have something that shes not afraid to drive!