You will notice the 3/8" rod used to set the starter in the correct spot as suggested by bruce.As it happens the starter was correct as bolted in the holes in the plate so no ajustment was needed.The dowel holes will be added to the adaptor plate drawing and the way to use them on the 55-60 starter is as follows.pull your starter apart and remove the pinion return spring and bolt your starter in position with the pinion extended.Check the pinion to flex plate to see if it spaced correctly(a paperclip is about right).If it needs moving use a round file to elongate the bottom hole in direction needed.Then put it back together and check it again.When you have it right tighten the bolts up and use a hand drill to drill through the adaptor plate and into the starter adaptor but not right through.Take apart and drill both plates to 3/8" you now have your holes to weld your dowel into.When you bolt the gear box on you can see how close the flange on a chev box is to the starter snout.You may have to grind a notch in the flange and on a p/glide you may have to do a small amount of grinding near the uper bolt hole .On a t/400 you will need to notch out as marked for the starter bolt.You could use a c/sunk bolt but you would have to remove box to change the starter.
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