Yes it will make a world of difference. In 1979 I had a Chevelle that was running 2.56 peg leg gears and always though the car was a dog but it went well form a 40mph punch. After I figured out it had Nascar gearing lol I found a free 3.31 12 bolt posi rear end which I and a friend installed on night where I used to work at. We raced going to the shop where I beat him by 1 car length, after the swap it was ugly and he got beat by over 6 car lengths, so Yes it will make a difference. 3.08 are a great gear for all around performance but the best gear is still IMO a 3.55 gear.Curious if the change is worth it.
Cruiser, weekend car. 454 and th350 2000-2200 converter.