Do you know the gearing? How much head work and does it have the stock 906 heads? Have you done a compression test yet?

It all starts with the cam choice. Everything else follows to match the cam.

Hughes
1.6 rockers and matching springs.
If your sticking with the stock heads, a good valve job, liners, guides cut to clear the valve lift and entry level bowl cut.

Obviously an aftermarket head can be had for the cost of machine work on the stock heads.

The dizzy will need to be recurved with more initial timing for these cams, and quicker advance rate.

A solid flat tappet cam would be better, but finding one that isn't too big will be a challenge. You can contact Jim at Racer Brown and he'll cut you one. The adjustable rockers and/or the solid cam will require new pushrods. Establish a budget first.