I'll check out the speed/rpm calculators and make my mind up from there. I do 99% back road driving and rarely hit 5th gear. I'd like to be in 4th gear at 45 mph when cruising since most of my speed limits are either 35 or 45 mph. Other highways will be 60mph at the most. Maybe this winter I'll remove my center section and have a new ring and pinion installed. Meth injection will be shortly after I return from San Diego in July.Yup. I went all the way down to a 3.08 for this reason.
Good luck
Be careful with the timing until you have a way to control the intake temps. I would pull .75-1* timing per psi until you get the meth installed.
So at 10psi you would want to be between 18*- 24*...... 24* being close to the danger zone without meth/intercooling.
(This is for street driven 91 pump gas cars, will allow some cushion for bad gas)