Regardless of the cam I hope the stock valve notches have been recut.As built they are way small and you will have issues in the outside corners of the cuts.That will limit cam choice.I have used them many times,with 86 cc heads and no milling of the block could be as low as 10.3. With 79cc heads and .000 deck they are easily can be 13-1.

Cam wise,I have had great success with the Voodoo line.60304 would be a very good choice.