As long as everything mechanical was running there isn't really anything you can do. I would give you some pressures to go by, but each time I've weighed it in it comes out a little different. I can tell you if you dont have a scale to just buy the small(4 or 6 oz) cans & depending on how many oz your name plate calls for you can come close. What is your low side pressure reading w/ a/c running now?
If your not breakin' parts your not building enough power. Big cube small blocks ROCK!