starter not aligning

[Angrywood]

I went out and just bought a new powermaster starter. everything looked pretty equal to what my original starter looked like. i did have to grind down some of the nose areas in order to get it to fit and bolt onto the bellhousing. however the gap between the flexplate and the starter gear is too small. hopefully someone can save me some time and back aches and let me know what bolt/s i need to shim to open up this gap and where to put the shim (between starter and housing or bolt and starter?) im hoping that will be all i need and it will be working. I was able to start the truck but the gears grinded while starting. dont worry.... no damage to the gear teeth on either side that i could see. heres my hole pattern.... crossing my fingers i get an answer as im tired of laying on by back under the truck!!