What model and years of vehicles have the best non cc qjets and HEI distributors for a high performance rebuild on a 400HP 350?

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1985 Z28, Jasper Class 1 350, Edelbrock Performer intake, Dual snorkel air cleaner, K&N, Edelbrock headers, Catco 3" cat, Hooker 3" cat-back, Richmond 3.73's, built 700r4 w/Darrell Young 2400 stall TC, JET Stage 2 chip, Hypertech coil, Lakewood LCA's, Powertrax locker, SSM subframes, Centerline Auto Drag's

 

Since your going to be putting up some impressive HP I would suggest looking for a BBC with all the goodies intact. The reason being most BBC's have healthy rods/jets in them already. But any 73-80/81, distributor will work fine. But then any 73-81 carb should be fine to start with.
SSC

 

I would look for a carb and distributor from an L82 'vette. The L82 cam had a 450/460 lift and appropriate duration and as a result the advance curve and off idle jetting would be closer to what you will need.

Many years ago I built a 350/327 for my chevelle. It was a real dog until I got the right carb and distributor. I tried a BBC q-jet and while it worked great wide open it just never drove that well. I changed jets, metering rods and power springs but finally gave up. I think the of idle circuit just couldn't be modified enough to handle a smaller engine. I got a rebuilt carb and distributor with the right codes and with a bit of tuning got it to where I wanted it.

Good luck & cheers,

Duane