How hard/expensive is it to switch out gearing on an A-body?

Ottmundr said

Welcome! I'm just down the road in Santa Rosa.

I'd keep the 3.91 gearing, but the most I usually drive is maybe 40 miles for long trips. I absolutely hate my 2.76 pegleg, but it's staying till I can completely replace my 7 1/4. I like that 6pack hood he has on that car. I agree with getting a second center section for trips, and swapping back and forth as needed for trips vs around town.

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Yeah, the more I think about it the more the current setup seems pretty sweet. I like the idea of a second center I could swap in- usually I know when I'll be making a trip and can take some time in advance. Are there any specialized tools I'd need to do this? I have the usual garage stuff- sockets etc. as well as access to a metal shop, but it's geared more towards general machining than auto stuff in particular