Flow numbers

ok, thnaks for the information so far, guess I will ask the stupid question and what does push rod pinch tubing mean? Ive never worried about head flow before so all this is new to me. The j heads I bought someone has gone into and cut the ports and it appears to be somewhat sloppy work. Can that hurt the actual flow? Im going to start with them and if I have issues once I am up and running I will look for another head set as a change. I am building a stroked 360 and plan on using a Comp roller with solid lifters, 308 @ .050 .575 lift, An edelbrock 2x4 setup. I didint want to spend the extra on heads at first but now Im thinking maybe I will end up with something different in the long run.
Thanks
Rod