727 3rd gear feels more like a down shift

720hp/3600#=.200 P/W which is good for 137ishMPH, at under 10; so you're right on target; good luck.

Judging by your current numbers (posts 40/41), it would seem there's room for improvement. If your foot was in the carb, the trapspeed is down some 6 or 7 mph so it could very well be that the trans is sucking up some power.
Just in case you might be thinking I know anything about racing, tho, I don't. I just read a lotta books and stuff,plus I'm old,lol. Naw, I'm just a 64 yr old street maniac, with 400ish hp.But she traps about right, going 93 in the 1/8th with no tune whatsoever. I drove to the track, ran the number, and parked it. Then spent the day in the bleachers with my 24 yr old son.Then drove home; Good times.