I worked on it for probably 4 days straight. I used the flywheel and clutch from the donor. The transmission had the same splines, and bolted right to my chevy adapter also from the donor. The only mod there was that I had to make a longer push rod for the clutch, and grind out the adapter to allow the slave cylinder to fit. On the top bolt, I cut out the side of the bolt hole on the transmision, so I could slide it in from the side.
As far as the springs, try it and see how it does. If it sags too much, you could use springs from a 454 SS truck. -Nicholas