My 440 sixpack at start up is running great after 1/2 hr or so of street driving the car starts to run sloppy and stall at every stop sign and red light. The engine has a comp cam# 21 227-4.timing at 10 btdc engine compr 9.7/1. Also when I am trying to start it at this point fuel shoots out of center carb like a fountain....fooled with mixture screws still cant get it to run right. I let the car cool...drive it again starts all over. Also checked timing does not jump. Thanks Rob

if fuel is shooting out of it, you either have too much pressure(electric fuel pump) or floats are not set right. or some combination of the two.
mixture will not help.

No electric fuel pump here.

could also be heat build up in the carb presurizing it. but I would say that should not last long.

either way, recheck your float levels first.

I would have to agree with the float adjutment. When the engine is cold it needs more fuel as air is more drnse. When it warms up it starts flooding. Hope this makes ence to you. Also how is you choke set?

Pull the needle and seats......clean them. Stuck float.

I WOULD SAY ITS A OVER FUEL PROBLEM OR BAD COIL......COULD BE A CHOKE STICKING OR THE FLOAT IN THE CARB AND IF YOUR RUNNING A COIL THEY CAN GO BAD WITH TOO MUCH HEAT.SOMETIMES IT COULD BE A BAD PLUG.

choke may not be coming off

Minute debris in the gas letting the float leak/bad needle & seat assy/needle & seat or float mechanically hanging up in its range of travel/idle psi on the edge of too high. I'd replace the filter if any doubts about it's veracity and sub in a new needle seat assy & reset the level & go from there. EDIT meant to say minute debris letting the needle/seat leak

Thanks...all good stuff for me to ponder anything else would be apprecited...nobody think electrical?

CUDA8U seggested the coil might be getting heat soaked. (?)

READ CAREFULLY.......FUEL OR COIL PROBLEM!!!!

Yep but the O.P. asked about an electrical source for his problem and I just mentioned what you said. READ CAREFULLY AND TURN OFF THE CAP LOCK PLEASE.

is your heat riser blocked? fuel is most likely boiling in the center carb. try putting race gas in it (much less volatile) and see if it's ok.

Friends Nova did this after 5 minutes, bog and die and flame out when starting. it was fuel pressure related off a blue pump. contaminated seat would do the same.

I did read about the bad coil just wondering about the orange box heating up and shutting down should have been more specific I guess.

It did backfire once.