Physically fit? Yes, if it isn't a bus or a type III. There are some adjustments / changes you have to make to get it running and working well.
Any vw engine that you can fit into the engine bay.
a 912 Porsche engine will fit in a beetle
yes
As long as the 73 isn't a super beetle then yes they should fit.
It depends. Generally, the answer is yes, as long it is bug to bug, or other like models. It is not true of the bus, as it changed engine formats right about then.
any engine carburated i would go with the 1600
if it is out of a super beetle you could have some problems. if not though, it should fit
Answeryes
Yes It will. no problems. might have to pull and tug when you put it on.
The same place all of them are, between the engine and transmissionat the flywheel.
1973/74 1600cc - 8mm head studs with case savers
the pancake engine will fit in any 72 - 79 bus without modification. the only issue is what size fly wheel to use to properly mate it to whatever transaxle is in the bus.