318 sb with a four barrel carb

Well I have had a couple of issues lately with my 318 not starting up after I have driven for a half an hour, then turn the motor off unload the kayak and gear and go to park and it just turns over and is real touchy about flooding it.
So the other day I was checking the idle speed and noticed what looked like a constant stream of air bubbles in the clear fuel filter. The bubbles were in the front side of the filter and even if I reved up the motor it still has a stream of bubbles. I never noticed this before and the car runs fine besides being touchy about starting after it is warmed up.
Thoughts might be the fuel pump is going out? The Fuel is boiling in the fuel line, it's not that hot here only in the low 70's to maybe 80 lately.
I have posted before about the hard starting and I'm not the only one with this problem, I might just have to try the 3/4" spacer under the carb.

Any thoughts would be great. Ted