Sorry I can not offer any help as such, but more interested in your set up.
They are high lift cams (no s**t), I think JUN also do a 264 11.35mm, is there a lot of additional head work to run those sort of cams and also regular maintenance (i.e. checking valve springs). Also, would higher lift cams be similar in using oversize valves, in trying to achieve the same thing in terms of having a larger opening for the inlet and exhaust valves.
Good luck with it,
Mike