Did you try
Supraforums.com ? Thats the diffinitive Supra community. Talk to guys like Houston T, T66Dawg, Steve Theodore, Ken Henderson etc and you will get every piece of info you are seeking. Those are there screen names so it would be easy for you to get your search on and pm them. Any one of them will give you the answer you seek. Everyone mentioned there has had a Supra over 1k hp so you will be in good hands.