if the motor is in good condition why not throw a cam at it and maybe do some heads or work a little love on the stock units?
if you don't have a converter and gears, that would be another area to upgrade. and while i wouldn't say that stuff is cheap, it's an alternative to dropping massive coin.
you could probably do all that for about 1/2 of what a stroker would run (if you're swinging the wrenches yourself)