[Gaz64]

Check your float levels are still correct PRIOR to the next cold start.

If you're running a mechanical fuel pump, and your carb fuel is evaporating after hot shutdown, then you'll suffer on the next cold start.

Have you got the throttle open when trying to start?

Consider getting the choke to work correctly.

If you can get 15-17 inches of vacuum, the motor must be fairly mild.

My mates solid roller 355, single plane manifold, QFT 750 and MSD 6AL fires up with a half pedal pump AND idles within 30 seconds.