Greetings, I have a borg warner 4-speed in a 74 vette and am installing a 300 hp 350. My rear diff has 410.1 gears in it. My questions is what is the better combo? Replace the tranny with a Tremec 5-speed and keep the 410's or go with 336:1's??? and keep my (already rebuilt) 4-speed tranny? I have little or no desire to drag around the streets and am more interested in cruising. thanks for whatever advice you can offer.