Go with the 4:10's if you plan on staying NA, if a blower is in the near future get 3:73's. The 4:10's will be fine on the street and with a 5spd, I only turn around 1700-1800 in 5th gear with my 3:73's at 65-70mph. I am going with 4:30 gears which will suit my combo, run around 2300-2400 at 65mph I think around 6300 through the traps.
Good Luck on the new combo
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Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC exhaust 1-5/8" Long tubes,2-1/2" O.R H-Pipe,2 1/2" cat back, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension,S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!