Will GM 200r4 work with factory floor shift location?

Here are some better pics of the protruding taper headed bolts. I'm a machinist but I don't own a machine shop so I can't just borrow a vertical mill and increase the depth of the taper in the adapter plate. But I can (if necessary grind down the top face of the tapered screw. It's only sticking up about .008"-.015" so it won't weaken it much at all. I say only .008" to .015" but that's a lot when it comes to transmission/engine/torque converter alignment!! Power from the engine has to be applied in a perfectly straight line so it doesn't blow apart.
Then again it might be the purple paint in the tapered hole...I'll have to check it out.

Treblig