Easy (?) OD Auto Install

I’ve got a 904/8.75 with 3.55 rear on my 69 Barracuda.
Other than going with a Gear Vendors O/D, what’s the easiest overdrive transmission to install that involves the least cutting/grinding/fabbing/welding?

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I had a 200-4R built for my '69 Dart by Extreme Automatics in Amelia, OH. No cutting of my Dart's trans tunnel to install. Some trimming of the pinch-weld area under the car was all. I also used the US Car Tool 67-75 A-Body GM 200-4R crossmember kit.
Extreme Automatics cuts off the stock bellhousing and uses a bolt-on SFI-approved cast aluminum bell from Reid Racing. No need for any additional adapters.
I had mine built as a manual-shift, reverse pattern so no need for a TV cable.
I'm going to be running 4.30 gears but the .67 OD will make them like 2.88s when cruising the SoCal freeways.
Win-Win!!!