Hours of FABO research yielded that in the event of using the adapter, a longer (adjustable mancini/MP) pushrod is needed ($75) in addition to the $40 adapter.
I'll pocket the 100 bucks and get some weld time in!
thats wrong. if you do not use the adapter you need a shorter rod. the new style master cyl. is drilled shallower then the stock ones. the adapter is the same thickness as the difference between the depth of the two master cyl holes, so with the newer master cyl and the adapter you will use the stock push rod. newer master cyl and no adapter you need a shorter rod.