I have a fast 2.0 on my 440/505, I just bit the bullet and am having a cam ground for the fuel inj. set up. Have had trouble w/ too close of lobe separation, and never could get it quite right, (not enough vacuum).
That being said, I use to run a 800 double pumper w/ blow out protection on a fairly hot 406 sbc, and loved it, never had a problem other than keeping my foot out of it and burning a fair amount of gas. I wouldn`t run a carb w/o blow out protection!
