hay ca18det into a 120y will fit fine as tunnel is slightly bigger if u are going 2 use the stumpy box.. and slightly bigger engine bay.. the crossmember wound have 2 be fabricated up your self or a mechanic.. dumby fit motor as im positive they only make kits for 1200 ute..
it woul be a easieir coversion as u have disc's all ready on the front.. diff would have 2 be changed.. and new tail shaft, new fuel pumps,ect
all up expenses are usually about 6000$ for a conversion it seems alot but... well worth the fun and enjoyment and reliability /fuel efficiantcy..