The problem/reason why you can't find a hyd TOB is because they are not "pull-style", they push the forks.
915/930s require a pull style TO, UNLESS you change to a push style pressure plate. Look at most of the kits you see and they always are small diam twin or triple disc setups. Those use push-style pps.
If you want to use a stock design pp you have to pull the TO. As for the 930, you might be able to get a full flywheel/trip disc/hyd TOB setup but that flywheel will bolt to a Porsche crank. Nothing out there yet for a hyd TOB/SBC/930. I have been searching for one for years and nobody is making it.
tilton will make me a setup based on all of my conversion components, but they required both nuts, not just the left one
I would give my left nut for a lot of things, but both is a different story.
Maybe I need to start a "group buy" thread
Maybe get a dual disc 7.25" setup for under $3K if I buy one, driveablility, and Bill (3 guys that are not too stoked about their Kennedy Stg IIs). One of us would have to send in the Kennedy flywheel/clutch package so they could reference dimensions, then still have to get some sort of deal like WEVO has that mounts on the stock arm or I have seen a TO/sleeve kit that you remove the slider tube (which I think both Bill and driveability have gone thru at least one of those), bolt on an adapter and TO bearing (see link below)
I called and left a message and have emailed these jackasses and they haven't responded, but that 930 setup they have with the right custom flywheel would work perfectly. If anything maybe they have the 930 TO adapter all worked out.
http://www.jbracing.com/flywheel-porscheul1.php#custom_fwIn any event, getting a good clutch in these combos is going to be serious money IMO. Course I got about $1500 in a rather marginal setup at this point - it has worked fine for me thus far but my left quad is about double the size of my right one