Guess you would be aware now the VH40 is for disc / drum application. You would have been better with a VH44 you could have plumbed it straight up. ..Bugger.
I just added a VH44 to the front [discs] on my little Triumph.
Im about to add a VH44 to my 35 pickup, drums all round.
My 56 Fairlane on concessional has the old Irish Dave power dual circuit setup. [see as Rick said]
"Came too close to dying to stop living now!"