Here are some better (I hope) pics. The tip of the master is 8 3/4" from the firewall. I made my adapter to position the MC so that I would not have to notch the rib for the rear fitting. To save space, you could just drill a couple of holes for the GM master to bolt directly to the firewall. That would save 5/8".
As I said, this is a '74 F carb on a 2F manifold and it uses the old style cable linkage. I needed to raise the carb enough to clear the bellcrank on the cable linkage. My new JimC carb has a different cable setup, the one they use in Oz. I guess because of the RHD deal they are all cable linked?
Sounds like Mark is all for a dual circuit braking system, just not in favor of the GM master? That was what I was trying to find out. IIRC, it has a 1" bore, but there are also stock FJ40 masters with an even larger bore. Seems like I read something about that. Dunno
GL
Ed
As I said, this is a '74 F carb on a 2F manifold and it uses the old style cable linkage. I needed to raise the carb enough to clear the bellcrank on the cable linkage. My new JimC carb has a different cable setup, the one they use in Oz. I guess because of the RHD deal they are all cable linked?
Sounds like Mark is all for a dual circuit braking system, just not in favor of the GM master? That was what I was trying to find out. IIRC, it has a 1" bore, but there are also stock FJ40 masters with an even larger bore. Seems like I read something about that. Dunno
GL
Ed
.........in the conversations with Mark A. he is very much against a unboosted system on a pig becuase of the 55s weight/inertia...BUT looking at your solution; 
there should be not problem boosting the front circuit via a remote booster; we were doing this in the 60s........I like the elegance of the way you solved the problem and just have to figure out where the cable setup will go; should be getting it when Mark A. gets back from Moab and can get a better feel for where everything has to go........rest asssured I will not drive a single circuit on the road, it is an accident waiting to happen; in aviation there are certain circulars put out by the FAA called ADs and they are mandatory to comply with; if you fly without complying with them you do so at your own risk and as long as nothing happens you are OK BUT if as will happen sooner or later you have an accident because of this failure you will be in serious trouble with the FAA if you survive and aircraft insurance will probably not cover any damages, injuries or death because of the "flying recklessly" and "failure to comply with mandatory AD"......
Ed thanks again for all the help and advice and 
me on the right track 
!; now have this situation; a 79 running 2F with manifold in a 69 pig; have an f 1/2 rebuilt carb in box from some dude in Burbank 
also from the same source a conversion kit in box to change linkage to cable......have a new booster and master off the 79 pig......what will I need to get it set up like yours? and what pieces can I use from mine?...... TIA;
...so I figured I'd post.
