Very nice set of photos, Chris
You are doing a great job of bringing this to drivability.
Nice looking 261 you are putting into it. You probably know that yellow was a 261 truck engine color for several years? Was that one yellow originally (not that it matters)?
It looks like you are not relocating the water pump? Do you have a short-shaft pump, or, is there enough room in a COE for that water pump?
Sorry about the questions.
You have more motivation than I do. Your COE will probably be running before mine will.
Keep at it - we'll enjoy seeing your progress photos.