Is he going to stick with the 273 or put in a bigger SB?
The reason I'm asking is the RPM drop between each gear on the wide ratio trannys may not help that little motor on a road course
![work work](/ubbthreads/images/graemlins/custom/work.gif)
You should convert the tail shaft and output shaft to the later type that you can use a conventional slip yoke and U joint on that end of the driveshaft
![twocents twocents](/ubbthreads/images/graemlins/custom/twocents.gif)
The E body tranny have a completely different longer tail shaft and out put shaft designed for the E body shifter mount
![scope scope](/ubbthreads/images/graemlins/custom/scope.gif)
The 1970 AAR Cuda and T/A Challenger and all the 1971 and later OEM 833NP trans. had a closer ratio gear set in them which may be better for road racing
![scope scope](/ubbthreads/images/graemlins/custom/scope.gif)