Just go to any cam sight (woods, andrews, t-man, s&s, etc) and look at their cam specs. They will tell you pretty much what their bolt in's are and what requires more work such as springs. Head work will always make the bike run better but it's not a required thing unless you get much more radical than what your looking for. Typical would be the woods 6-6, t-man tr-525 or se255's. Again, go to each site and look for your bolt-in cams.