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Fuel here in central Ohio is ethanol swill... I'm running 92 octane. I set the base timing so as to get the highest vacuum reading I could last night and didn't get the light out to see what it is. I know its high cause its hard to crank over... even with 10 deg dropped out with the Mallory box's start retard. I'm just starting out... I know my total is way high... The unilite dist is very adjustable.
I am using A/C plugs but don't remember the number 43 maybe?

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I'ne never used the highest vacume method to set the initial timing, I start at 14 to 16 BTDC at a very low idle, under 1000 RPM and then shoot for 34 to 36 degrees on Mopar BB and 426 Hemi by welding up the advance slots in the distributors that need that done to set the total timing (less total timing(30 to 32) on Mopar SB) I try to lean the idle and transition circuits out to have 14.2+ AFR and I like to use a the coldest spark plug I can use that will not foul out with that tune up Works good, last a long time BTW, pinging and detaontion is hurting your parts Fix it now