Re: 78 K30 Carburetor Issue
That application is exactly what Holleys are good for. WOT. Get yourself a good early Qjet. Go through it and put i ton. Use either a Chevy or Cadillac unit. Make sure the number starts with a 70. The early units are tunable. Get a book if needed. They work well, very well. The 2 main parts to tune are the idle screws on the bottom in the front and the secondary air valve. A little tuning on one goes a long way.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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