First, if you replaced the distributor & now it won't fire (assuming you had "something" to re-align the distributor at least close), then maybe you're 180-degrees off, meaning the engine hits top-dead-center (on the crank pulley) TWICE while #1 cylinder fires ONCE. To fix this, take off the distributor cap & look at the rotor. Loosen distributor hold down a lot, lift up distributor about 1", turn rotor to point in the exact opposite direction & put everything back together.
For your "no power anywhere" issue, there is a blue wire that exits the bulkhead disconnect (huge group of 3 multi-wire plugs inboard from the master cylinder on the firewall). That blue wire is the main power wire for the whole engine (maybe check for 12V there). That wire comes from the ignition switch & I think all the power goes through there, so maybe check the wires going in/out of the ignition switch by looking at a wiring diagram & unplugging the 5-6 wire plug at the far bottom of the steering column inside the car. Also, there is "main power wire" that comes from the alternator (?) and goes into that same cluster of 3 multi-wire plugs & I think winds its way into the back of your amp-meter that is supposed to burn out a lot, especially where it goes through the firewall. Many people (like me) run a second very large wire with a 70A-100A in-line fuse along that same path to protect that wire. I think there's also another better way to do the same thing, but I can't recall.
The most basic approach is to follow a wiring diagram, starting with the battery, and just follow the "+" until you don't get any power. Battery --> bulkhead connector --> ignition switch --> bulkhead connector --> ?
Hope This Helps....
