automatic overdrive

what trans can be used for overdrive automatic behind small block in dart ?

My daily driver, completely self built.
1995 A500 (42RH) completely automatic with a manual shut off for either OD or converter lockup.
Stage 2 Transgo shift kit.
Tunnel hump modified (not floor cut) trans cross member redesigned, shortened driveshaft, longer speedo cable, some adjustable pressure switches and a couple of solenoids.
355 geared sure grip does 80mph at 2,300 and 25mpg on the hiway with a mild (350hp) 5.9 Magnum.

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