I fixed the problem. Its the power valve. I took it out and jetted up 9 sizes and the stumble is gone and driveability is what I would expect, can lug it in 3rd gear with no bog or stumble. Slight hint of detonation so either take timing out or run better gas.

The carb is cranky at idle like this. I will have to find a power valve to stick in it.

I may end up with a bigger cam at some point, I was looking at the comp cams computer controlled cams.

I put some converter in it because I may race it on a pro tree the odd time and its important to get some revs up to nail the tree.

What power valve should I put in it?

Thanks
Glen