Personally I'd go with mechanical linkage. From what I've read the vac system can be very tricky.
But then again, I'm having my own tri-power issues, so I'm not expert.
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Thad
1958 Chieftain Safari (370,4 spd, 9 passenger) Daily Driver
1966 Bonneville Wagon (Factory 421,3x2,4spd, 9 passenger) On the road!!
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