8 3/4 gear swap

Rob here's my opinion,

Yes you can use a spool on the street. Is it a good choice, NO. Spools don't allow the inner wheel to turn at a different speed than the outer tires does, which is what happens when you make a turn. Thus the reason for the invention of a differential. Either the inner wheel has to spin or the outer wheel has to spin when your running a spool. Not good for street use.

Since your running real short tires I think you'd be better off with a 3.55 gear. After all you said it's mostly for street use and it's a mild BB which will have plenty of torque to spin even 3.55 gears with super ease. I ran the numbers on my calculator and with 3.55 gears you'll be spinning approx. 3100 rpm at 60 mph and at 70 mph you'll be spinning well over 3500 rpm. IMO that's screamin right along. With 3.73 gears you can add about 200-250 rpm to each of those figures.