Shortest answer I can provide is... I'm a Ford guy lol!!
That being said... I actually had a Q-jet on my 360 ford in my plow truck until just recently.
Q-jet in all honesty is a remarkable fuel delivery device, it stands far out from the croud of conventional jet and power valve metered carbs.
But, it can be a love hate relationship. High maint IMO.
If gruff does have a q-jet, I'd suggest running that fuel pressure in the 3-5 psi range, no more than 5.
I'd also suggest he look at the float first as the plastic foamish floats are kind of notorious for becoming saturated and not being able to close the needle. The needle has a wire clip that has to be installed correctly as well. it is very common for q-jets in particular to have this spring installed incorrectly. Also the welch plugs often leak in these carbs, it was common for them to be installed and also JB weld sealed on rebuild to help prevent leaking.
We'll let gruff come back with an ID on his carb before I go dishing out too much trouble shooting though.
