Thermoquad phonelic bowl

You can test on the bench using an eye dropper. Leave the pri jets in place. Set up the bowl so that you can see the jet wells. Put some absorbent paper underneath. Do one side at a time. Carefully add fuel to the bowl to cover the pri jets, but not high enough to dribble over the edge of the throttle bore opening. If fuel is going to leak, it will leak straight away.

If no leaks, there is no need to go further.
If you get leakage:

with a file or Dremel cut off wheel, grind out the existing white epoxy & roughen the area around the joint so that the black plastic is rough [ for good adhesion ]. Use JB weld or other fuel resistant epoxy to re-seal. Test again, as above. Make sure the epoxy does not bulge out or the gasket will not fit.