Opinions needed on upcoming CST Blazer Build

[Rust Buster]

So I need some opinions here. I have decided to change direction on my 68 GMC K20 build (in my signature), and put all of the parts I've bought for that into my 71 CST K5. The drivetrain will be a HT383 GM Crate Engine with a custom Mass-Flo EFI system mated to an NV4500. What I need help on is the rear end choice.

I have a new full floater 14 Bolt in the truck that has 3.42 gears. I also have a very used rear Dana 60 from a 72 GMC K20 with 4.10s and a locker. I'd most likely rebuild the Dana 60 with 3.73 or lower gears as the Blazer is not going to be a hard core offroader but rather a daily driver with lots of highway use. I also have a rebuilt 12 Bolt already in the blazer with 3.07s, but I am pretty sure that is my last option. Which would you go with and why? Is the 14 bolt overkill for the blazer?