A Body gearing

So it looks like my 60 yo butt may get a job again, after 2 years. Quick lowdown; 70 Duster 340, purple 234, .484 cam, pistons .017 out, ld4b, 727 reverse manual with 3500 stall. Hasn't left jackstands since work started in 1987, 10 pt cage.

So back then, I put in a narrowed Dana spool, 4.88. 4 link. Reading lately, I will be running too much rpm in the 1/4. Trying to make a jig for 31 or 32" tall tire (tubbed to 21" at top of fenderwell), the only way I can find to fit the tire is trimming the front quarter ( wish I had moved it back before I had the driveshaft built). add on, I think I need at least 16" wide for street.

So, what do you think it will spin in the traps? Any options other than going 4.11? A lot of you guys in here have more real world practice, thanks.