Ditto ryany.

Have your oem alternator rebuild instead of buying a "rebuilt" one. The failure rate on these is about 100% on this forum.

I suggest looking for the oil leak this way. Degrease the engine, and then puff baby powder on the suspected sites after a short run, then blow off the powder. The leak tracks should be obvious.

My primary suspect for an oil leak at the rear of the engine is the rear cam bearing cam, not the plug. You can pull the valve cover, use rubber glove fingers to hold in the lash addjusters in the rocker arms, then umbolt the cam bearing caps and rocker shafts and remove them. This frees the rear plug and reveals the ungasketed surface at the rear cam bearing cap. Reseal the plug with rtv, and put a smear of rtv on the metal/metal surface the where the rear caps mate up, being very careful not to block the oil passage thru the caps that feeds the rockers and valve train. Replace the rocker shafts/caps and put a smear of rtv on the right angles of the vavle cover gasket at the rear where they arc over the rear cap. I also reseal the semicircular packing at the from with rtv, although I've rarely seen leaks there. The rear cap/plug is a common leak source, since it sees pressurized oil in the vavle train oil passage and has no gasketing expect on the plug perimeter in the good plugs (usually metal with a rubber rim or heavy platic).