UPDATE:
The heat riser is fixed! A new shaft and bushings have been installed. Thanks Achipmunk

!!
No more Rochester B-lues! I took some sound advice from Hotrod Lincoln and located a Carter YF. Thanks Hotrod Lincoln

!! After a good cleaning and a carb kit, the GMC 228 runs like a clock and idles steady at 450 rpm!!!
As Phil Robertson would say.....I'm happy, happy, happy
