Retard on 75 shot? My accel ignition doesn't have adjutable retard

Wondering if I only go with a 75 shot for know if I'll have to worry about retarding the timing. Since my accel ign doesn't have a retard feature is there anyone out there that makes a kit only desinged for reatrading timing? Thanks

As long as you have not added anything like a Hypertech to advance the timing, I have been fine with a 100 shot and no retard. You shouldn't have a problem.