I don't think dynoing mine up at 5280 ft would tell us much.
Since we are talking racing now, my '70 Challenger Convertible with a healthy 360 has run a best of 15.0 @ 94 mph at Bandimere @ 5800 ft. Doesn't sound impressive but with the altitude adjusted that's a 14.1 @ 99.3. 3.23 gears and a rather mild stall converter are costing me at least a half second, but it cruises at 75 nicely.
4:11 and a gear vendor overdrive sound appealing but a tremec 5 speed is what I'm saving for.