1967 c10 no power

[dtkarst]

I’ve got a 67 c10 that’s got me stumped. It’s a 6 cylinder, 4 speed. Motor is a 75-78 250 inline. It was running and driving, everything working and the fuel pump started leaking one day. So I got a new fuel pump, changed it, didn’t mess with anything else and now it’s completely dead everywhere. No headlights, nothing. Of course it happens on the day I was gonna put it up for sale. I have 12 volts through the firewall connector and to the ignition. Changed the ignition out and still nothing. I can put a screwdriver between the posts on the starter and it turns over great but no fire. Can anyone lend a helping hand on this one, please. Thanks