Heres a cam idea for the DOHC

[your_I.D.]

Ok i've modified an exh cam to work as an intake cam. 2 nights of some carefull grinding, here are my results:

[series8217]

It could also be timed by making a tool that locks into the holes at the back end of the cam where I imagine it was held by the lathe at the factory. You would just need a bar connecting two forks that locked into each side and then bolted tight to hold it in place until you get the cam cogs tightened a bit. You'd definitely have to use a cam cog holder to get the bolts tightened, I don't think it would be able to hold the cams in place as well as the tool that mashes the flats down.

[your_I.D.]

Heres my timing thought. Figure out amount of crank degrees differant there is use original cam timing flat. Turn motor until that degree is reached. We know the lobes are evenly spaced around the cam. We know were the exhaust lobe centerline is and were intake centerline is. Just have to figure it out and use a degree wheel and turn crank and lock the cam down. (I have a custom cam cog holding tool and a cam timing tool from 60degree store)