Below is the last published speed tips from MP from there 2000 catolog. This should help answer a few questions on what works and what doesn’t.

At this time, it seems that the recent take over by Fiat has resulted (by Fiat’s hand or not) in the discontinuation of all parts. Substitutions will have to be made from other vendors.
Cam pages
Suggested reading.
Purchase the books!
For Poly engine guys, the address and phone number for Racer Brown.
Camshafts listed below. But you may want an...