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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