well guys I'm just taking an opinion. I'm debating on what to do. Currently on my 305 I have a 4 barrel rochester q-jet 500 or so. should I one get this holley double pumper 600cfm for $125 or do you think I should just hold off and get a 670cfm street performer holley for $300? (the carb off this will go on my 350 when I drop it in and it's going to have some nice power. 400-450 range) thanks.