Very good work.
Work on the front end to get it loosened up. Keep chipping away at the 60'. Squirters and pump cams and jet it up until MPH slows down. Move your total timing around a bit too. Change launch RPM, try loading it hard against the converter pushing through your brakes, then, try nailing it from just off idle and everywhere in between
There are some things you could change that would help et/mph. A 904 and more converter would pick up at least .15 and 1-2, maybe 3 mph, victor 340 or Air Gap intake (I'm not a fan of the strip dominator). The trans is really if you go nuts and want every bit it has in it.
Nice runs! :cheers: