with the advance unhooked, using a light the timing marks stayes steady, but then the chain is 40yrs old..and it runs decent with the points dist.. I am using a new NOT rebuilt A-1 cardone dist POS IMO..

the springs on the mech advance to me are very tight compared to the points dist which isnt 40yrs old(re-man)
I think id been better off buying a JY dist..

so anyway what or how do i check the springs?