The silicone brake fluid was all that I used on a daily driver 55 Ford back in 1991, a daily driver 56 F100, and it is still what I use today for any and all classic vehicles. Excellent characteristics. My late model cars all use DOT 3 for the obvious reasons such as resale, maintenance (man, that DOT 5 stuff is so much more expensive!)....
Go ahead and use it, but make sure you never mix the two.
Daniel JessupLancaster, California
aka "The Hot Rod Reverend" 
check out the 1955 Ford Fairlane build at www.hotrodreverend.com