440 /super charger add on ?

iam not sure was told just next up from stock..after ckn carb linkage..seems to ldle at 1000ish @ in gear around 850-900. The whole setup come off of a running 440 that last ran at Christmas. I put this setup on my running 440.dyer told me to back it off a little..and set it to 26..My dual point distributor, I believe had 26 degrees mech Advance built into it. And I ran around 6-7 at the crank..fir a total of 33... If my thinking is correct all I would have to is set it to 0 with a timing light at 1900 RPM I believe that is When my distributor is at full advance so that would be 26 correct.

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