Changing drivetrain questions

[orange72c10]

I'm getting ready to change the drivetrain in my 72 long bed to a Blueprint 383 and Monster transmission with an Eaton posi. Does anyone else run this setup? I am going from the stock 350 and turbo 350. It has the 3.08 gear ratio in the back now but I have read it will be a bit sluggish cruising around. What gear ratio is everyone running or experiences have you had? I read a lot that says 3.42 or 3.73 would be a better fit...any help would be great!