whats the best paint for the dash?

Go to your local PPG dealer. They will mix it up for you. Just follow the instructions sheet that you can get from the dealer.

Unbuffed lacquer looks right also.

I used rattle can semi-gloss laquer (as sold by the repro houses, in colors matching their "soft part paint")

just used rustoleum 777,my buddy has a 68 thats what he used.

i used oer's lacquer dash paint, it looks real good, lays down great. you cant tell it was applied with a bomb can.
but, unfortunately i purchased a can recently for a couple of small pieces i needed to finish, and was informed they no longer sell the lacquer, due to a california pollution standard. they however sell a new "exact match" to the old stuff in a new non lacquer version. unfortunately it is not near the quality, and is a tottally diferent shade, (imagine that, a repro item that disappoints).
so the moral is, i would look elsewhere now, and make sure its a semi gloss lacquer. i think toby keens' suggestion is the best bet now for sure.