Overdrive tranny in an A-body

I checked into this, and found out that the best fit for an A-Body is a 700R4 GM transmission. It is almost identical in length, and, according to Monster Transmissions, along with several other online places, there is no floor modification to be done. I found a few places that, for around $2500, will sell you the tranny and all needed parts to do it. It's been in the back of my mind for awhile now. And, yeah, I know, stay with all Mopar, yeah, yeah...not if I have to hack the floor of my car up to do it...I haven't seen too many high-stall converters for the 700R4 though..the most I've seen are around 2400-2500. Still, would be nice to cruise the Swinger on the freeway at 70MPH at around 22-2400 RPM instead of 34-3500 RPM....:-)