I had the same problem
I think you might have a vaccum leak. I had one from an extra gasket between the spacer and the carbafter that was out it ran great.
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67 C-10 350 with 3-speed tranny and 308 gears swb step 
82 Z28 Camaro 355 small block over 350 hp and a borg warner super t-10 (blown engine)
72 Chevy K20 Suburban (future project)
70 Chevy K20 now 68 GMC K2500
2003 Chevy 2500hd ccsb 4X4 (daily driver)
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