Questions about 318 timing

I just checked the timing on my 318 and as previously stated it was not fully advanced till 4,000 rpm. Vacuum advance disconnected the total advance was 20* from idle. The distributor is a stock electronic unit. I will be recurving it soon. Anyone have an opinion on the transdapt kit with the flyweights? Jegs has it for a whopping five dollars.

Probably just springs. The pictured stuff fits a GM distributor.