A new master cylinder for the 74 is cheap, for the 66, rebuild it.
As for fluids, without talking synthetics, I use...
Here's what I use;
 engine oil                20/50 engine oil (Castrol)
 transmission fluid        50wt engine oil
 rear axle                 90wt gear oil
 brakes                    Castrol LMA dot 4
 clutch                    Castrol LMA dot 4
 radiator                  50/50 antifreeze/water
 airconditioner            R-12
-- 
Frank Clarici
Toms River, NJ
http://www.exit109.com/~spritenut
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