swap from ZS to SU

[mit-eddie!mlb.semi.harris.com!jshoe@EDDIE.MIT.EDU (Jeff M. Shoemaker)]

        From the data I have "heard" over the network; it seems that
a swap to SU's is more practical (performance and cost wise) than
repairing Zeniths !!! ???

        What exactly is involved ??  manifold revisions ??
Is there somplace to buy rebuilt SU's (or trade ) ??

        Any other comments on whether or not this is a
good plan of attack ??

        Target vehicle is 75 TR6.
                                -jeff
                                jshoe@mlb.semi.harris.com