What is the best way to get an overdrive auto in a 67 Barracuda?


Reverse Valve Body Manual Shift with Factory A-Body Auto Console, Shifter and Linkage?
Without cutting/modding/fabbing tunnel or cross members?
Bolt up to G3 Hemi?
Looks like about $2519 before shipping. $650 adapter and $1869 Trans with non LU TC. + $$ for any mods?

Have a 727 already and Cheetah MSRVB.
Add GVOD for $2795 with free shipping through Christmas. Shorten drive line. Massage tunnel, all factory linkage, shifter and console.
Does what I need it to do and not much more cost assuming the 2004r is a straight bolt in replacement that does not require cutting or welding the tunnel or custom linkage or cross member. If there is cutting, fabbing and welding... probably a wash.
And it's a GM... that alone pretty much kills it for me.
Don't get me wrong, I love my Duramax/Allison but I'll keep them my Sierra 4x4 Crew Cab.