I would use the orange dot one. I use one in each of my motors.
But set the clutch height properly- when all assembled, the diaphragm spring should be flat.
Often these days you need to machine .040" or more off the 3 lugs of old backplates to achieve this.
see
http://www.minimania.com/article/153/Cl ... non-Verto_ for how and why this is important.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
