........ 2.73:1 in the rear, 0.75:1 in the trans, and 28.6" (Y)-rated road tires puts my RPM at 7249 to go 301 MPH. which brings me to the 4L80E....
Just a couple more things to think about. Hooley's Stude weighs between 5000 and 6000 and with a 1.90 first gear and the 2.47's and with the old motor, probably between 800-850 HP, 40-50% throttle is about max without blowing the tires off. The 80LE with the 2.48 1st and the 2.73 rear will make 1st about useless.
Our second was a 1.30 and he still wasn't able to run WOT in 2nd ever. Not until the 1:1 3rd and the 7% overdrive was he running WOT. I think you will probably find that you will be running 3rd and overdrive and 1st and 2nd will be pretty useless. We went with the 101 to stay away from a huge rpm drop between 3rd and 4th. A high HP turbo motor might make that drop ok, but we are still tying to keep it at a 15% max even with the new turbo motor.
5 miles is also a lot longer than most dyno pulls and Subaru happens .
You are also going to need to buy landspeed tires and the goodyears at $600 a piece and they are a tad under 28 inches so just a bit smaller than the dia. your quoted. I get the same speed at rpm you do just wonder about that big jump going into 4th. You are going to have to make sure your power band is wide enough for it.
Figure probably $5000 for the required safety equipment to run over 200 with a blown front-engine car.
Keep studying and keep planning and try to avoid some of the screw-ups some of us have done . We are just trying to help in that direction,
Sum
I accept I still have a lot to learn, whether or not my wishes are compatible with this rulebook. I'm still only 20 pages in, it is a lot to absorb, even for a guy who knows drag racing V8 ponycars intimately.
The RPM drop into OD can be offset with torque converter stall.
With a remote adjuster for the wastegates, I figure I can do 0-7 psi in first, 7-14 psi in second, 14-21 psi in drive, max boost in OD.
I know this has been done before, I just have to figure out how to make it comply with the rulebook. anyway, the only real strain on the engine will be in OD, not the whole 5 miles.
The 4L80E gearing can't be helped, without wasting a grand on an aftermarket 2.20:1 first-gear gearset.
I'm attaching Holdener's dyno results.