I have 10" rims with 5.5BS in my 68 Satellite . I currently run 28x10.5 Pro bracket radials no worries . I have also run Hoosier 9x30R15 radials on a 8" rim , this is a 29.9" tall tyre , with no issues.
I run a 29" tall street tyre , 255/70R15 . I did try a 295/65R15 MT et street radial , 30" tall , it just barely touched the dogleg , rubbed some masking tape I put there . This tyre was only driven around the block , but was on a possibly wrong offset rim - rim was a 10" for a E body
I have Mopar XHD springs with Caltracs
Good luck

Tex