SU carb problem

[Mel-S3]

I have a standard spitfire Mk4 with standard SU carbs that i had reconditioned last year by a reputable company. just got round to fitting everything back together after some other restoration work. The carbs have been set on the basic setting to start the car. The problem i have is that, firstly the car will only just manage to start on this setting, then after 3-4 minutes, after it has warmed up, it stops. It seems to be running rich, i have screwed up the jets until they are nearly right up with little or no change, have also checked all the other things on the engine and carbs, as per Haynes manual. Any advice would be greatly appreciated.

Must mention that before the carbs were recon they were running rich, but it did run and drive. Thought a full carb recon would sought the problem out because they were very worn.

[Mel-S3]

Thanks for the replies. I have adjusted the carbs better using a colour tune and carb balancer, which has, I think sorted the problem of the car running rich, although I had to screw the jet up nearly to the top on one carb - is that normal - the other is about 8 flats down. Unfortunately this has not sorted the problem of very poor starting and the engine cutting out after about 5 minutes. I have rechecked points, timing (what is the best way to do this accurately, do I make any allowance for unleaded with additive?) and plugs. Any more ideas?

[Mel-S3]

Thanks for the help. In the end it turned out to be a dodgy condenser! The car had a new one only 280 miles ago, but it had been stood for nearly twelve month. There was also a little trouble with one of the Grose jets. Removed these now and gone back to the old needle valves. Fingers crossed all is now well.