4 speed overdrive or A999 automatic

Planing an a body project for next winter.It will done for a daily driver as cheap as possible using a stock 318 with economy (MPG) in mind.I have a 4 speed a body overdrive and an A999 automatic transmission.Have everything to do the A999 will have to get all the clutch stuff bellhousing flywheel etc for the 4 speed OD I do have the clutch pedals.So with cost and used as a daily driver which would you do?