I have a frame that appears to be a Contemporary frame ( I built one 20 years ago) and I'm not sure that the transmission cross member is in the right place. When I tried to install the motor, the motor mounts were to about 2 inches too far apart front to back. I did some measurements:
1. from the back of the front frame cross member to the front of the motor mount stem: 19" +/-
2. from the back of the motor mount stem to the transmission cross member is: 38" +/-.
3. from the back of transmission cross member to the front of the rear frame cross member: 19".
So could some of you kind folks with a big block Ford and a toploader, climb under your cars with a tape measure and send me similar measurements.