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First the centrifigal advance--yes the electronic igntion has that too. I use the equivalent 4 cylinder distributor from a '75 240 (B20F) in my '69 144S. I've never had to replace the control unit in anyone's similiar unit (used in the early 240 B21) but the distributor itself has two potential trouble spots. One is the winding which can short out--symptoms usually are--intermittant conking out with no spark after engine warm-up--spark returns on cooling off-- and eventually total failure. The other faiure is even rarer--the tiny pin which secures the reluctor (the 6 legged thingy) to the shaft--I've seen this pin disintegrate and turn to powder allowing the reluctor to shift position. I mention these things just so you'd have a heads up. This igition makes a very strong spark. My 144 went from having to crank maybe 3-4 revolutions before firing up to an instantly running motor in the winter. ON CHECKING THE CAM -- rotate the motor by hand and observe each of the valve springs compression amount. WATER INJECTI0N 101--I'm a true believer--but I haven't had my system operational in a few years--ever since the addition of alcohol to our gas mixture. I originally set mine up because of spark knock. I've seen ads for very sophisticated systems for big $. I would guess they work very well. My system cost me next to nothing and also worked very well. I used a Plymouth heater valve (Dad's last used car business was a taken over Chrysler-Plymouth dealer-with all its parts stock) for a RWD (hurrah!) car. The valve is vacuum controlled-high vacuum off--no/low vacuum open. I ran a manifold vacuum hose to the valve control. Cruising off- acceleration on. I sleeved the inlet/outlets of the valve down to vacuum hose size and then used a carb jet to further restrict the water inside the hose to the ported inlet. I used a 140 windshield washer tank for a resevoir (too small though--would empty after a half tank of gas) and for the liquid I used washer fluid and ran it through a plastic VW Bug fuel filter. I've since made a little collection of knock sensors with the idea to have one trigger a relay to operate a washer pump--but lack the electronics knowhow to complete the idea. --- Dave