Your description of those races in Texas sound like the MTI Z07 that was built for SW. It has run 9.7s at 142 or so. Its a 427 with a 200 shot. Probably around 750 rwhp. I wonder if the Supra was SW's also. Intersting.
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if it's cheap & reliable, it ain't fast, if it's fast & cheap, it ain't reliable, if it's fast & reliable, it ain't cheap