3.55 gears: what speedo gear to get???

I'm finally getting the stock gears taken out for 3.55 gears along with the bearings. I've looked into the Speed-Cal unit and also found out that total accuracy can also be had if both tranny and axle tooth gears are changed. Well, I'm not going to have my tranny taken out and I've heard that the axle gear is real simple to install. I'm also figuring that I have 2.73 gears, but that won't matter once this is done.

The Speed-Cal unit is nice, but it is overkill for me, I think. From now on, my tires will be 275/40's starting with the next set, so there are no plans ever to change tire size.

If the 23 tooth gear is what I need to be very close to accurate, then that's what I'll do. Will this also correct the odometer readings or will that be off forever? I just don't want to regret doing gears if the trade-off is spending lots of money for accuracy OR racking up imaginary miles.

Thanks. (I've researched as always, but most go with 3.73's. I drive a whole lot of interstate trips, so I need a friendlier gear)

23 is what I was figuring on. I know some say they get "chewed up" but if it only takes a few minutes to replace AND it's cheap............amen.

Any idea how far off I'll be with the number 23.

Also, will this correct my odometer to pretty close?

I'm borrowing a new Mach 1 for a few months and it's got 3.55's. OMG, combined with the DOHC motor it is absolutely awesome. RPM's aren't bad at all.