4.3's = same bore & stroke as a 350. CPI wasn't available AS AN OPTION until 92. the first year or two of production they had a Q-jet on them. great little engnes , VERY small difference between it and a 305 as far as power goes , but gets better fuel mileage. sound sweet with good duals too.
BZZZZZZZZZZZZZZZZZZZZ. DAVE
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with all the rocks that I turn over I should be finding more than slugs!
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"been there, done that, ruined the T-shirt".
2007 LBZ GMC Sierra, ECSB
2006 LM7 RCSB Silverado
98 Vortec project.
94,3500,6.5L 4L80
81 SWB GMC POS finally gone 
73 Pinto, stock, w/CragarSS's-eww 
84,C10 SWB-Yella,stock
86 K10 SWB-Red, hopped up 305,4/S
LOTS of Cummins trucks.
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