Ok let me start off by saying I am building a 350(washed it down today and start tearing down tommorow) I am running stock flat top pistons comp. should be around 9-1 I am using the vortec heads. I was planning on using the extreme energy 262 cam, but tech says these are hard on the valve train so I am still considering. Stock manifolds dual exhaust.(headers are great if you don't have to work around them) I have had a built 454 about 350hp and a car with an lt-1. This is my 3rd vehilcle (i am 20) and my fisrt rebuild (with my dads help) I want good power and decent mileage. I am going to run a/f ratio gagues on both sides of the exhaust and I really wan't to tune this motor well. I haven't had the much experience tuning carbs, but the only you learn something is to do it right. So after all that is said, the only choice I have not made yet is wich carb. On my 454 I had an edelbrock and had no problems and that is what my dad runs( who is NOT a hot rodder) but I have heard the these carb are suposed to be pretty good. I want to know if anybody has had any experince with the road demon jr. 625cfm ( reliability ease of adjustment etc.... ) in comparison the the edelbrock performer 600cfm.