Will this tire combo work?

[6carmello8]

This will be my last tire question..I promise

Will this set up work on a 1968 Camaro (it's mini tubbed)

255/35/18 Front

305/30/19 Rear

The biggest problem I had was matching a tire that has similar sidewall height.

Obviously if the sidewall height in the rear is slightly taller than the fronts, no biggie.

From my calculations the front side wall height would yield 89.25 mm in the front and the rear would yield 91.5 thus be a working combo for the street?

Is this correct?

Thanks.