All depends on your budget and fab skills. Nothing is going to just bolt right in without some persuasion. Late model wheels are not hard to get aligned in hardtail frames, you usually have to make custom wheel spacers anyways. I have a 77 motor and rear wheel in a c&g frame which wasn't difficult to get rear wheel alignment perfect.
As said look at cyclex, cycle one, voodoo vintage fabrication
Depending on your state and titling look into facebook marketplace, craigslist and ebay for full survivor frames.
The second pic looks like a santee swingarm frame