Ignition help needed (stumped)

Thanks, yeah i have the dash out, been probing like mad, theres power to the dash main power in but zero power to fuse block . I have all sorts of test lights and digital so good there. Wiring not my strong point mechanical much much better.

Just going to add a few suggestions.
Be real careful when probeing under the dash or pulling the instrument panel out. The wires connected to the battery positive can be accidently grounded and then there will be sparks and within a second or two the fusible link will melt.

When you can, describe he wire by more than insulation color if you can. Size, what it does or the connection point, all can help.
I'll come back to this in a second post.

Note what options the car came with. In particular, if the car came with a rear window electric defrost grid, it probably has the 65 amp alternator wiring.

1975 model year may have/probably has a seatbelt interlock. Thats probably why the previous owner hacked the iignition.
See the posts later in this threadContinuing to track down source of no voltage to coil while cranking by @Bugman and @67Dart273