G'day,
I converted my '82 aircooled Transporter with an EJ22 6 years ago this month. I used a very common GM radiator with a couple of lugs welded up font behind the radiator grille to support the radiator.
You WILL need to cut a new hole to get a better air flow. Buy a grille from a later watercooled van to fill the hole. One of the Subaru Radiator fans does for the radiator.
I'd be happy to chat sometime and for you to look at my van.
Dave
OH - to get past the machinery inspection you MUST have a demister, believe it or not. That is a problem unless you put in a watercooled heater.
I did this eventually, but the inspector told me to go away, buy a $20 12V hair dryer from SuperCheap and wire it into the hose at the font. That way I had a warm air blower until I replumbed the front. I needed a bit of duct tape to seal up spaces, but this was easy.
Oh, also, the Subaru radiator overflow tank will fit into the space up front behind the grille.
There IS a significant issue with these vans. This is the space between the air intake of the engine and the firewall. The problem does not ocur in the watercooled vans because of the position of the engine/transmission in those later vans.
The most reasonable way around this not-insignificant issue is to buy the air intake duct for an '80-83 van from KEP (
http://www.kennedyeng.com/). Their wiring diagram is invaluable - I could possibly show you a copy!