www.UMTRNorth.com is our website.
It's an all stick shift group that runs at NE Ohio tracks.
We run Quaker, Mag, Thompson, Pacemakers, along with one at Pittsburgh which is their Nostalgia nationals and we run with Pro Stick which is an East coast stick group. We just finished up our season a couple weeks ago.
High rpm isn't an issue with a toploader power wise, it's the rotational weight of the gears and it won't powershift with brass in it for very long. It will wear the ribs off, thus making it very difficult to shift. I ran mine to 6K and it lasted all summer back when I ran one. Over that threshold, it will go away quickly. Faceplating it would make it better. Overall power is still a concern especially with stock gearsets(hardened), but the correct clutch will help.