No power lights etc but ignition turns over?

You can do an analysis like I just did this morning in the 'lost all power thread'.
The one difference in circuits for a '74 will be the column connector for the in column ignition switch.
'74 will have othersmaller differences but the basic power arrangement is all the same. So do analysis the same way. See whats in common.

PS. Get a shop manual which will have a more complete and accurate diagram. Then use that to draw just the circuits your interested in.