3.31 to 3.73 worth it?

4:10's are definitely not highway friendly. My Cuda had them in it when I got it and I hated them. At 60 mph. it sounded like the engine was going to blow. Tell me something, why do you have a 727 behind a 273? That's a power sucker right there. There's absolutely no need for a 727 behind such a small engine built that mildly. Switch to a 904 with the low gear set (most refer to it as the 999) and you'll gain just as much as swapping to 3:73 gears and it'll drive down the hwy. just like it does now and get better gas mileage doing it. Put a 2500 stall in it and it'll be even faster.