Fuel or spark or????

[OgCoda]

So it's been forever but I finally got my truck running today. Got The distributor dropped it at tdc and it started right up! Ideling just fine and throttle responded all the way through without any dead spots or stumbling. So I took it out for a drive. As I pulled out into the road I noticed right away that the truck was stumbling kinda jumping and as I past about 1/4 throttle it cleaned up fine but then as I shifted from 2nd to 3rd it did the same thing, and did the same thing going into 4th. So In each gear after I get past about 1/4 throttle it's fine. I'm not the greatest gear head so I figured I'd ask you guys. Can't really think what it could be. Any help would be great.

Truck: 1971 Chevy c20
Motor: newly built 307
Trans: 4 speed manual (newclutch/flywheel)
Carb: edlebrock 650cfm 4 berrel
Intake: edlebrock high rise
Distributor: hei