Sorry, I thought that you had run it AFTER you cleaned it out. I would put it all back together and run it.
Never mind the proform, I see that you have non-choke tower holley. The only way it should be square jetted is if it has no power valve. If it has a front power valve, you need at least a 6 number jump from front to back. Standard is 8. I would run 70 in front and 76 or 78 out back. Check your vacuum at idle and then choose your appropriate PV.
