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			This Solved my Idle problems per the Tech paper above. 
		
		
		
			I selected the (B28) since it Met the "Rule of 2" Installed today and tested collected tuning data. Because of my Howards Cam MECHANICAL FLAT TAPPET AMERICAN MUSCLE CAMSHAFT; 1965 - 1996 CHEVY 396-502 (MARK IV) 1800 TO 6500 HOWARDS CAMS 127192-14 I was getting Poor Vac signal at idle in combination with a sedate vac can (B1 from a L35) caused VERY poor idle in Drive. B28 Solved this concern, Runs Great on Full manifold Vac signal taken by "T" off the choke pull off pot hose. 
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	69 Los Z11 68 SS/RS 396/325 68 Los Z28  
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