My 2 cents worth----I built a 27 T roadster with a 350/350 in it. It just didn't have tha punch that a car that light should have. I put a cam and a new 4 barrel in/on the 350 engine. ---better, but still 15 points short of awesome. Then I swapped out the rearend gears (they were 2.79:1 or 3.08:1)---nor sure which, for a set of 3.55:1 gears. GOOD LORD!!! WHAT A DIFFERENCE!!! It finally acted and felt like a hotrod. And the car still operated commendably at highway speeds.---Brian