help with starter/timing

[Sacramento70]

hey guys i'm having a bit of an issue. i just replaced the old starter in my 70 blazer with a new skip white 3hp mini starter. i tried 2 shims, 1 shim, and no shims but it still grinds right as the motor starts. i also replaced the old distributor and upgraded to hei. my father has said the timing could be what is causes the starter to grind. it sounds healthy upon start all the way till it turns over but has a slight grind that i know shouldn't be there. any info or help is much appreciated. i did use the new bolts and the wires are correctly hooked up to the best of my knowledge.