I'M NEW SO PLEASE FORGIVE ME?

I have heard rumours or something somewhere that you can swap all the internals from a J125/Starstream into a 75 Vega, is this true???
If so, is it then also possible to do it with the Lui50??
Are the engine casings the same size, what about the Cento 100, will that fit a Lui??? (seen a top end on ebay)

Cheers, I know I'll have to search the Conversions section, I'm lazy I know.
It's just I think I can get hold of a J125 cheap??? Possibly???

Shhhh

Lui you need 3 speed J range parts
Vega you need 4 speed starstream parts
They are not interchangeable
If you want to fit a whole engine you will need to fabricate a bracket for the rear shock

You are forgiven my son, oh and hi