Welcome aboard.
A fellow I knew in Northland in the 80s succeeded in putting a 302 into a Mk3 Cortina. Not sure now whether a Windsor or a Cleveland or what transmission he used, probably an automatic of some description. The rules were very different then so definitely read the LVV Manual before you get too deep into it. Best of luck.
https://oldschool.co.nz/index.php?/topic/89804-mahaway’s-mk3-cortina-restoration/