And - I'd set the initial timing at 8-12 degrees, depending on how she starts - 12 would be fine if she starts up well (especially when warm) if not, back off to 10, then 8 if necessary.

I'm assuming that you know about the different length push rods, cam button, different distributor gear. (I believe Howard's retrofit cams have an excentric to drive the fuel pump rod - but check to be sure).

Let us know how it goes,
Glenn