Question about 18" wheel/tires with 2/4 drop

[K25alive]

Looking for feedback from members that have actual experience running 18” wheels and a 2/4 drop. This Spring I plan to install Western Chassis 2.5” spindles and new 4” lower rear springs on my daily driver ’77 stepside, 454, Big10. New wheels and tires are next. I don’t want any tire rubbing or other suspension problems with these. For wheels I’m looking at US Mags Roadster U120’s:
Front: 18x8”, 4.5” BS, tires are Hankook 255/45-18
Rear: 18x9.5’’, 5.29”BS, tires are Hankook 295/45-18 (can only find two mfrs for this size tire)

The BS on these has me a little concerned as most of the BS I’ve seen are 4” in front and 5” rear, although those were on 15” wheels. I want to stay with 18s and not go with 20s as I prefer some sidewall to even out the ride. Want to keep the tires close to 28” diameter. So, is anyone running these size 18" wheels/tires on their 2/4 drop without issues? Or will it be a problem?