Ok its been wo years since my car has been completed and I have driven it maybe 200 miles. Main reason being is that with the stock 3.90 gears in the rear and the speed this car is screaming at about 50mph. My plan is to take out the 4 speed and replace it temporarily with a new tremec 5 speed. I am running 14" wheels and dont understand the differences in transmissions and their gear ratios. Can someone explain to me the differences with these options and tell me which would be best for me>

Tremec TKO 500 TCET4616(3.27 first with .68 fifth), TKO 600 TCET5009(2.87 first with .64 fifth) or TKO 600 TCET4618(2.87 & .82 fifth)