Thanks! I always use distilled, but they only had drinking water. Luckily, not much leaked out, so I didn't have to add any. I mostly bought the water "just in case" for the drive home. I also drained the entire system, because if you're interested in learning how stupid I am, I neglected to refresh the radiator hoses when I bought the car. The lower has a date stamp of 11/18/85. At least I think that's a date stamp. Either way, the car sat for 20 years before I bought it, so the hoses are at least 20 years old. I'm gonna go buy a lottery ticket, because I'm darn lucky this hose didn't burst on the interstate.Hope you got distilled water, or plan to flush it.
New plugs in the truck went fine except for one terminal that ripped out of one of the plug cables, got that fixed without too much trouble though. I also pulled out about 2 degrees of base timing; she runs like a champ now, very smooth and responsive I'm glad I did the upgrade. And now the ignition system will be ready for when the time comes to swap a built 440 for the mostly-stock 360.
If anyone is looking for a multi-spark Capacitive Discharge box not made by MSD I'd recommend the Pertronix Digital HP, for $240 you get something half the size of a typical MSD box but has 3-step (burnout, launch, fatal) rev limiter and a bunch of other programmable settings like start retard. I believe it's also designed to be incorporated with standalone EFI systems. I've barely put any miles on it so can't say how reliable or long-lasting they are but so far I like it a lot. You can even "bench-program" the box with a typical small 9V battery it's pretty neat.