Running a locked msd pro billet on my 12.5-1 493 . I have a digital 6 w start retard, but still get starter kickback and hard starting from time to time. Very annoying to say the least, but once started it runs awesome. Contemplating swapping distributor for a non locked version, or perhaps wire a start switch so I can get engine cranking first and then hit ignition. Built as a race car that wants to do some street cruising as well. Any thoughts?