440 getting hot

I have the same problem of overheating in my 62 440. I have a new alum rad, water pump, and serp belt with a pusher fan. Motor has about 3K on it now. I put the front end on my lift and lifted it up and removed the rad cap. Started it up and let it run. I saw air bubbles and let it run. They did nit seem to stop. What's up with that.