So Bill, by flex, i think your meaning the flexplate correct??

would it be possible to pull my PCM with my engine for the swap?

by modifying the harness, could you be a little more specific with what you did to it?? P.M me more information on that.

Could i swap my DIC into the GTP aswell?

If i can swap my N-A 3800 into this GTP with little complications I'd be happier than a pig in sh1t, i need a DD not a street stomper.