The bellhousing is the easy part I only drilled four holes in it and trimmed the edges. The butten flywheel is a Quartermaster that has the correct bolt patten but it needed to be spaced out .700" so I cut the back off an junk crank and machined it to index center. The flexplate is a NLA tilton 102 tooth chevy I have five of them. I hog out the center and drilled eight holes and it fits perfect to the back of the butten flywheel. The adaptor plate is 3/8 plate aluminum I leved the car perfect used a plum bob to find vertical and used a dial indicator off the crank and centered the bellhouseing drill dowls holes to keep it centered and drilled the rest of the 3/8 holes and cut off the extra. In the plate I used Time-Sert steel theaded incerts because of the thinness of the plate. The trany plate that bolt to the bellhouseing I had to cut down the thickness so the imput shaft would engage the inner clutch plate. I am waiting for 1/2" incerts for the trany plate. I am adapting a 1310 flange yoke for the differential and the I can order my carbon fiber driveshaft witch is an off the shelf item. Tilton will make a butten flywheel but even as a dealer it cost around $1400.00. I bought almost all the bellhouseing stuff on ebay and I have only spent $980.00 plus the $3500 trany and $560 drive shaft. But I sold my old Nissan tranys and extras for over $5500 so i am still a little ahead.