I think 69’s are about the same as ‘67 & ‘68 wheel well openings. (Correct me if I’m wrong) I didn’t want to cut my wheel wells for larger tires so I started off with 29” bias slicks, they rubbed, too much tire growth. I went down to a 28” Hoosier and they clear fine but put me through the lights at 7600rpm with 4.86 gear. After 20 runs I took them off and went to a 30” radial from Hoosier the one with the smaller roll out. They are actually about 29.5 but don’t grow like the bias tires. They clear ok, have to be a little careful exiting the track sharply with any speed, so far so good no rub marks and dropped 300rpm.
Mike, it's a stick shift car, and as far as I know, radials don't play well with stick cars. Pretty sure I'll have to go to a 4.5* gear to get my desired trap RPM, so I have another spare rear to look forward to, but I was debating on stepping up to 35 spline axles anyway.
