Just me personally, I think the a 2.71 rear gear is about the sweet spot for the 8HP70. This gives an overall first gear of 12.71:1. A 727 would need a 5:1 rear gear to match it. A regular 904 would need a 5.19 gear and a deep first 904 would need a 4.64 gear. Just for a comparison.
Something to be aware of is, the tallest ratio I can find for an 8.75" is 3.23:1 in new ring and gear sets. Kind of makes the 2.71 gear I would want a bit of a question.
I found a 2.76:1 for an 8.25", but even the 8.8 and 9.25 are limited to a 3.08 or 3.21 or above.
Used gears are an option, just saying that buying new setup might pose a problem.
Here's a calculator you can play with:
[URL][URL]https://www.dragtimes.com...6=1&gear7=.84&gear8=.67&calc_button=Calculate[/URL][/URL]