I'd say that engine RPM isn't what will limit top speed as the road feel at higher speeds. I've got a T5 & 3.73 gears now but when it was a 3.90 / no OD rig I drove across the USA & back at 65 MPH in my "60 but it ride is day & night from the Task Force models.


BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022