I would say more of a daily. But its not a car that I actually plan on driving daily if that makes any sense. More of a fun burn some rubber and run through the gears every couple weeks type of car. Could you elaborate more on the gear ratio from transmission to rear end. What's more applicable for a daily driver vs just a good set-up for a badass el camino?
Here's a chart of the TKX transmissions that are offered (there might be more but this is all that was on the chart)
Transmission ratios work the same as the rear end ratios. Bigger ratio number=shorter gear/lower speed. Smaller ratio number=taller gear/higher speed.
Tire size can also have a big effect on rpms. A taller tire will reduce your cruising rpms but will reduce your power. For example a 29" tire will give better cruising rpms than a 26" tire. When you see someone put larger mud tires on their truck thats why they will typically swap in a set of lower differential gears at the same time. You can find your tire height here
Looking at the chart there's 2 different 1st gear ratios (3.27 and 2.87). If you pick one with 3.27 instead of the 2.87 you'll have more power off the line meaning you'll be able to burn some rubber
There's also a couple different options for the 5th gear ratio. (.68, .72, .81). The smaller the ratio means lower cruising rpms. . 68 in theory would be better for cruising than the .81 ratio.
I say in theory because it depends on your rear end gearing.
a transmission with a .72 gear ratio + rear end ratio of 3.73 will have the same cruising rpms as if you paired a transmission with a .81 gear ratio + rear end ratio of 3.50
All I can say is mess around with that Spicer Parts calculator when you get to looking for a transmission.
With you wanting to cruise around 60 my safe recommendation for gears would be anywhere between a 3.50 up to a 4.10 for your rear end ratio. Maybe even up in the 4.30 range.
Your 3.73 will probably work well.