Carb story (A and B)

[Terry,NJ]

As I have said, My A (Coupe) has been running lousy lately and overheating on hills and I can't find out why. All cyls seem to be firing properly. Compression is lousy but equal. I don't trust my gauge, A 1960s vintage Schauer that reads only 25 lbs . The car starts and runs too good for this to be accurate. Altough, testing the gauge shows it to be ok, there's still the performance angle.
So checking out the dist. shows nothing, I looked at the carb which had recently been rebuilt. Checking the throttle shaft, I found about .005-.007 throttle play/slop in the shaft, Is this too much? It was not bushed.
I removed the A carb. and replaced it with a B carb. Hopefully killing two birds with one stone. There was a reason why the B carb wasn't used before! The engine starts buts seems to run out of gas after about 15 seconds. So what is my problem? Not carburetor at all? is 5-7 mils play too much? Gees! I'd really like to know.
Terry