Hello There!

I'm looking for knowledge from experienced engine builders please!
I recently got hand of a 1971 Vespa Sprint 150, which belonged to my father and just started its restoration. It's been sitting for a few decades and was neglected when in use (not seized, however!).
So, I proceeded with disassembling the complete engine for now (will then proceed to other sections) and am looking to do a complete rebuild, where necessary (new bearings, new seals, etc.). Hopefully no new piston and cylinder if within specs (still to be measured).

I noticed I will need a new crank (rusted clutch end and keyway severely worn).

However, when disassembling the crank (equal ball bearings on both sides) I noticed 2 things:
- The clutch side bearing came assembled in the crank, but the flywheel side bearing (tapered side of the crank) remained in the case. Wasn't it supposed to be the other way?
- Tried to put the crank (and bearing) back in its race and noticed that it goes in without much effort. I keep seeing people mentioning that the cases need to be heated (to expand) so the bearings can go back in its place but this is not the case. The bearing and crank (without its seal, because its worn) go back into the respective race with no effort at all.

My question is: is this normal? I've seen people mentioning that this side is a "floating fit" to compensate thermal expansions of the materials. Is this true or does my engine have worn-out bearing bushes? What should I do in this case? I don't know which interference is supposed to exist between the bearing and the bushing so I can't manufacture a pair of bushings. What do you recommend?

Cheers!