Knowing how GM was/is into keeping as many parts as possible that could fit several applications, I would have to say that the mounting tabs under the dash would be the same for vacuum and electric. As long as you can acquire the complete system, as noted by Mike B, I would think it would bolt in.

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