if you go electric ,go a 'puller' ,not a 'pusher' fan , you`ll get more air thru the radiator...as for me I took my electiric help fan off (that former owner installed....it was a pusher , and was blocking more air than it helped..) Is it a 400 or a/c car? if so make sure you have all the fillers...( X fliiers, mastyicated, lower baffle)
also could be a bad fan clutch if you have one...
many things could be improved, the best is probably the water pump impeller spacing as Loren states...