I'm currently running a set of #531 T.A. Pro 3 Attaches arms set up to a single #203 track chainwheel as a Pista setup. I'm using a campy NR Strada BB with a 112mm spindle. The chainline is just slightly off, but by no mean anything to worry about. Thanks to the info from Fred & Mark, I'm gonna try the Tevano cranks with this same set up. I can't image that T.A. would create a completely new track BB spindle for the Tevano line, so I thinking it will work just fine. I'll keep you all updated once the cranks arrive.
Thanks.
Sean Flores
San Francisco, CA