1970 Buick GS 455 Base 7.5L

I have a very rare 1970 Buick Grand sport. All body work has been done and paint job. Car is as straight as when it came out of the assembly line. Engine has been changed from 350 to 455. Engine is out of a GS 455. Engine needs to be finished but is full of after market parts. Needs transmission. Car has all new suspension and all new brake lines and bearings, nd has been undercoated for a smoother ride. A lot of work and money has already been put into this car. Over 20k has been put into car. I have all additional parts except for the glass. I have paperwork and receipts for everything that has been done to confirm work.