what size tires are you gonna run?
with a 28" tire and those ratios (.7 od and 3.73s) youll be turning 2037rpm at 65mph and 2193rpm at 70 mph
heres a rpm calculator thatll help you se whats going on....
http://www.csgnetwork.com/multirpmcalc.html
you might want to consider 3.42s...that would give you 2011rpm at 70mph with a 28" tire