Parallel Axis and String Spacing

[lexsongs]

Parallel Axis Trembuckers are planned for neck and bridge, with STK-S4 in the middle.

Question: Which string spacing is preferable on a Callaham replacement bridge/trem block - 2 1/16 (narrow) or 2 7/32 (vintage)?

Guitar is a '74 Fender Strat , with that smaller nut width as well.

Thanks