nutwagonfromhell you should have started a new thread.
But either way if you have a GX200 6.5hp model, or Clone 6.5hp model. One of the best upgrades is to put the smaller 5.5hp head on it. This boost the static compression ratio up. Now there are two different small chamber GX160, or clone 5.5hp heads availble. One is 18cc, and the other is 14cc. I always use the smaller 14cc head "NO MATTER WHAT".
Later you can always have large valves installed, or have it ported ,etc.
Cams are limited because no body sells a race cam right out for the Honda. If they do it will cost around $250 for it. What you normally have to do is send out your stock cam and have it welded and reground into a race cam profile.
On the briggs you have simply going to a longer spring will provide enough spring pressure to run a mild cam. Now if your cam is over .300" lift you will be better off with running dual valve springs. But if you do have a cam that large, you will need a billet rod. The Raptor rod won't handle it.
I always have a lot of full race parts, but I don't know if you guys are really into that kind of stuff. But I will start posting it in the Classifieds area.