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how far you driving and how oftern do you like to buy gas. if not to far drivign i would go 4;10 if long way and gas is exp i would go 3:50
but if you ever want over drive eather.
I have 3.50 in mine now it is way to high and im running the same tire nd tranny as you.I have a 4.11 and a 4.10 and a 4.10 and a 4.09 to put in mine i just aint figured out which one yet.I am definately getting rid of the 3.50. It is too hard on the rest of the drive line.
3.50's are fine for that combo I'm running that in my 73 with a 302 I would like to go with 3.73 or 3.90's but I really cant see spending the bucks for such a slight change. 4.11's are nice but if you do a lot of hiway driving the RPMs will be up there but if even bigger tires are in your future then 4.11's would be the way to go.