I agree, I would think with a dual mc you would be upsetting the designed bias but I'm just thinking out loud, Can't see how you could retain the hydro with the dual mc.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy