for those who have curved their stock sm blk electronic distributor
...what springs did you use and at what rpm is your mechanical "all in"?
..tx guys.

I would set the initial with the vac gauge method then shorten the slots with the FBO $25 plate (fastest/easiest way to accomplish this) & get 31 total with mag/closed chamber heads and 35 with open chambered heads (initial+slots with can capped) then toss the heavy spring with the elongated loop on one end & sub in a Mr Gasket or MP light spring in lieu of it & keep the OE light spring for a good start. you want to stay just under the pinging point at WOT up thru the gears on your hottest/driest (most likely to ping) day. any ping you can hear is WAY too much and there is silent ping so you need a cushion (dont crowd the line too close). spring combo advances in a linear rate no matter what combo of heavy/light springs (after tossing the elongated slot one) you use so go lighter or heavier with either or both of em till you reach your goal and also you dont want the adv to start any less than 100-200 above your hot in gear idle speed which is what you will starting from when you pull away from the stoplight THEN plug in the can (if used) to ported & you want to stay just under the pinging point (same as before) in varying RPM/load conditions (everyday driving) on your hottest/driest day. CCW with a 3/32" allen wrench slows the curve amt added at a given in hg but not the total. EDIT found a chart, the crane kit is no longer available. I use the chart for the beginning of the curve possibilities not the RPM where they max. Every eng is different in dozens of parameters so proper max can be anywhere

tx RR.I'm not new to curving distributors.
any idea what rpm the Mr. Gasket Mopar light spring and stock light spring total is?

no intent to insult your knowledge, I just throw everything out there. not sure what the total would be with the mr gasket spring as opposed to the MP light spring (iirc the kit is a 925B) but I think it'd be fairly close to the 2300 listed for the other one

found my mr gasket 925B spring set & they state: the OE light spring and (1) Mr gasket light spring, this combo maxes at 2400RPM. as we know spring tension/weight friction etc varies but it should be fairly close. sheet also stated both mr gasket springs will max at 1200. EDIT no info given on the start RPM for one or both but it'd have to be fairly close to the OE springs as far as tension goes

Tx RR
I have those Mopar 925B springs and will try 1spring with the stock mopar small spring.
i am all in now @2000 rpm and would like to slow it down a bit.

another option is to grind the tips of the weights to slow the rate. sourceing springs to get it dead on can be a pain. EDIT if you have several light springs to choose from you could hang em on nails with a weight & see which one is the strongest