The Quill shafts go from the clutch through the transaxle.

They can fail at 400 hp. Good to have spares.

The yellow car frame has Mustang 2 front suspension I think.And the other frame has homemade/custom front suspension. I think.

The mustang susp. is good but they cut a big part of the front of the frame off. I am sure you can tell looking at the other frame.

So do you want to do minimal work and money and make a lower HP car? but get the darn thing going? or go much more modern on suspension, brakes, transaxle, engine?

The last picture does look like 1988 Corvette maybe.