I'm hoping the trans tailshaft/housing, crossmember & driveshaft from a THM 400-equipped '77 or earlier C3 will fit in my '80. The mounting point on the 400 is 5.5" further back than that of the 350, yet is laterally in line with the crossmember. Maybe the '77 crossmember simply has a dip in it to accommodate the mount. This 400 has a stubby tail, (possibly out of a truck) and sits less than 2" from the existing driveshaft u-joint. Any ideas will be greatly appreciated.