What tranny for a 318?

I'm putting together a 72 Dart Swinger as a daily driver.
It's all new.
It's a 318 that should go abt 280hp and I've used a 904.
Rear tyres are 28" tall and I've got 3.89 ratio.
I wanted 3.7 but didn't have any 3.7 gears around.
Should be around 2950rpm @ 62 mph.