If they are sealed beams, it's hard to beat a quality (Hella or Cibie)
drop-in replacement that uses an H4 bulb.  Make sure you get the "E-
codes" not the US-legal beam pattern.  I'd also recommend using a
relay harness.

more info here:

http://danielsternlighting.com/products/products.html
http://danielsternlighting.com/tech/relays/relays.html

The reflectors/bulbs are as easy as replacing a sealed beam.  Adding a
relay harness is a little more involved but not significantly.  don't
run "overwattage" bulbs without a relay harness, or in anything other
than E-codes - you can melt your wiring, blind oncoming traffic, or
both.

good luck

nate