Heads, how much gain?

well, would i be better off paying someone to port my 452 heads, or buy aluminum aftermarkets and run them with the stock ports and all, just have them checked? I want all i can get out of this thing as i have some chevy guys wanting to race.. I also need help i getting this thing to hook up. Its actually fairly quick as is but doesnt hook up. I want to do the inboard rear spring relocation kit and mini tubs so i can put some tire under it but i dont have a welder and cant weld anyway. I dont know anyone around here i could trust to pay to do it right..Thats the problem with owning a dart, not being able to get much tire back there..