I also love my T56 (done by Rockland Standard
www.rsgear.com)
However...
If I was you at 1,000 hp (I'm only at 700), I'd go Richmond 6-speed.
I've driven the Richmond 6 and it's much more civilized than the Jerico.
I might also look into a Jeffco, but the Richmond is a killer piece that can handle that level of power and still shift like a 'real' transmission.
~SP~