Garage find 340 4 spd Dart... keep it 440/727 or go 340 4 speed as OEM ?

So here goes, my first real post to FABO. Looking for a bit of feed back.... or words of reason..
A good dilemma to be in, I have two 73 Dart sports. My orange car was an old drag car in the late 70's with a warmed over 440 that was put back on the street in the late 80's.. that old 440 now has 16 years of hard labor under its belt... and still runs 11.8s with 90 psi of OP... it was a /6 car. But the heart of this thread is my blue 73 Dart, its an OEM TB3 340 4 speed car with black stripes and a deluxe white bench interior (it was repainted white then B7ish). Has all the tags but no build sheet. Since I already have a big block Dart, I am on the fence as to swapping out the 440/727 for a refreshed 360 commando along with a cast iron over drive 4 speed, the car has a stout 8.75 diff with good axles and 4.10 guts. All original panels with minimal rust... Going small block manual means putting a floor hump back in along with patching of the inner fenders.... keeping the big block means re-installing the frame connectors, 6 point cage and some electronics that came with the car. What would you do with this car ? Thanks. Jimmy

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