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I measured the total timing which is 36 degrees...so 20 degree advance (16 initial). Do you have a part number and a recommendation as to what springs I need to use to back this down to maybe a 16-18 degree advance? This is the standard MP distributor. Thanks! 
springs will not change the total only the RPM that the 36 total occurs. A heavier spring or springs makes the 20 deg slope to occur (start/end) at a higher RPM at any point in the slope (& less advance=less pinging). (1) see (& post) what springs are in there now (2) with your dialback & tach note the RPM that the adv stop advancing (that's when the slots are maxed). Here's a chart for a start tho the crane springs mentioned are no longer available but Ace hardware springs work just need to experiment with a slightly heavier one till you get just under the pinging point at WOT up thru the gears & the slope is linear whether you change one or both springs
live every 24 hour block of time like it's your last day on earth
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