I would look at a slider clutch you can make them handle "anything"
Are you thinking of a Crowerglide or something?
I'm also looking for something relatively inexpensive as I don't need to cut a good light anything. Just engage once per run.
Many clutches designed for this kind of power are extremely elegant engineering marvels and are priced accordingly.
The amount the clutch slips and the consistency are what the Pro Mod boys are looking for.
Just need a clutch to hold the torque. The planetary clutch packs will absorb the harshness of the shifts and along with longer than usual axles giving me some additional torque absorption, we hope to avoid the problems that have plagued the Speed Demon.