[DW31S]

I'd have to say that there may very well be 20 documented, as in bullet-proof paperwork, 4-speed, convertible, 1970 W-30s. Now, I'd be hard pressed to believe that in/out of that 20 real cars, that NOT ALL 20 have the ORIGINAL drivetrains. And for sure, only a handful---maybe less are W-27 cars, also. We all know these cars were ran HARD when new, some were ordered to race and specifically ordered to fit a certain class. The percentage of warranty replacement items further reinforces my point.
Lee has a VERY UNIQUE AND SPECIAL CAR and in all actuality COULD be (I'm not saying it is)the only one that has it's born with drivetrain INCLUDING the W-27 rear that CAN be proven without the shadow of a doubt. Again, all the best to Lee!