Wheels & Tires - Need help sizing 18" tires !!

I've decided to get BFG KDs or KDW NTs but not 100% sure on
what size.

I've got 18X8.5" up fron and 18X10.5 in back replacing the original
245/50/16's.

I would like the speedometer to be close as possible.

Reccomendations PLEASE I'm ready to go!

for the front maybe a 245 35 18 and the rear 295 35 18

Front 245/40ZR18 and the rear 295/35ZR18

Thanks - will post pics next week!