A15 changes needed:
* A15 bolts right up to the 1978 1200 crossmember & gearbox
* Exhaust pipe is 3-bolt for A15
* Shorter clutch release bearing sleeve (Or use A12 flywheel)
* Air cleaner differs
* Larger radiator needed than stock A12
* 1978 should already have the 56A gearbox, which is strong enough for A15

That crossmember fits any late A-series engine (A14, A15, late A12)

thanks guys,
Mine is 1978 :)
Attaching pics of my crossmember.
Looks like I will be able to swap to a15 without any issues?

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Unless somebody put a mid dizzy 120y engine in an early ute then they would have possibly fabbed up engine brackets. In which case maybe confirm the year of your ute and a pic of crossmember. To confirm if A15 is a straight bolt in. As you said the previous owner said engine was out of a 120y.

120Y was 1974-1978. Utes of the same year used the same engine. For engine swaps the most important thing is front-dizzy (1970-1973) or mid-dizzy (1974-). All A15s were made after 1978 so they are mid-dizzy type

Pretty sure 120y use mid dizzy engine as pictured same as later utes. Another way to tell if A15 will bolt in is look at your engine crossmember does it have two tall mounts for engine or one small one medium ? 2 tall mounts is early crossmember one small and medium is late ute crossmember.

thanks guys,
Also is there a difference between a ute a12 and a 120y A12?
Previous owner did mention that he had swapped the engine with a 120y engine but is there a way to check?

Mid dizzy

Hi dd,
Attaching a pic of my A12 engine. Can you please advise if this is a mid-dizzy or a front-dizzy?

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Depends ...

If your ute already has a mid-dizzy A12, then the A15 will bolt right up. But it you have a front-dizzy A12, then the crossmember will need to be changed or the mounts modified