here's the calculator:
[URL]https://spicerparts.com/calculators/transmission-ratio-rpm-calculator[/URL]
from my own experience, 3.23 is the best all around compromise. i've driven my car 727/3.23/26" tire coast to coast several times, up and down the pacific coast from the tip of bajaj to alaska and all points in between.
with the 904 you've got a better, lower gear set so you're not going to lose all that much coming out of the hole, and it's not a racer either.
that G3 will happily lope along at 3K all day long too.
if i had your set up and was building a car right now for what you're trying to do, i'd go even lower with like a 3.10 knowing that i have the power to push it, the low gear set for the jump and that i'd be cruising it.