As you have found, four door Series 2a are very rare, and Series 3 only slightly less so.
Converting one to four doors is theoretically possible, but most body parts are not available new, and would have to be sourced second hand. Second row doors in particular are very rare. 110 and Defender doors can be used, but post 1987 have different handles and locks. Similarly, the rear body could be used from one of these, but because the rear axle location is different the side panels would need extensive modification or replacement. I would guess that to pay someone to do the conversion, you would be looking at somewhere in the region of $20-30,000 - there is a lot of panel beater type labour involved.
The engine change is simpler, and cheaper. These engines are about - the four at least. While converting an original six to a four or vice versa is possible, to do it properly would be fairly expensive if paying someone to do it. Four cylinder engines are fairly common, and are interchangeable up to the end of Series 3 production. If the Holden installation did not include changes to the front cross member, the changeover should be able to be done for a couple of thousand. A running engine should be findable for $500 or so, but plan on a couple of thousand for rings and bearings etc. Add things like a new clutch, and you should be less than $5,000 paying someone to do it.
These are ball park figures, and depend very much on finding the right bits, and who you got to do it. A lot cheaper to do it yourself! (But regardless, the vehicle will never be saleable for anything like what you spend to get it!)
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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