I just installed a FBO dizzy advance limiter kit in my Coronet R/T with a solid 290 comp cammed 512/4sp/3.9. Local pump gas is 98 octane.(Australia)

In my application, I limited it to 14 deg total so I can run about 20 deg initial running to about 34 total.Vacuum advance not used in my case.

Also the advance springs were changed to delay the total to about 3k to compensate for the heavy car.

It went pretty good before, but it goes like a raped ape now...and revs VERY cleanly with no real chance of detonation with the low total advance number (my engine has high comp and alloy heads also-iron heads and lower comp would be better with up to 38(?) deg.)

Good kit for less than 40 bucks.Easy to install-good instructions
From "4secondsflat.com" guy.....
NEW From FBO

"Do it Yourself Advance Limiter Kit #J685

This kit contains our Exclusive and Patent Pending Advance Limiter Disc, RPM springs, complete step by step Full Instructions and our 47 Page Spiral bound"

"Tuning Guide"