iso replacement engine for 81 300D

I have an 81 300D (non-turbo) with a blown engine. Research online has shown me that this is a '617.912' engine, common to the following models:

78-81 300CD 77-81 300D 79-81 300TD Wagon (only listed as 617.912 in 1 of the 3 online resources I saw)

some questions:

Do I have any other options other than the 617.912 engine? there are other 617 series out there, would these fit with minor mods?
Can anyone recommend a good source for used engines? I remember last year finding an online classified/board of some sort that listed engines by mileage, all were good used compression tested engines. cant find it for the life of me now.

please reply on-list, the email addy I provided is a dupe (I'm spam-phobic ;))

thanks, jamie

me that this is a '617.912' engine, common to the following models:

You ACTUALLY need a 1980 or 1981 engine, and NOT a 1981 wagon which has a turbo.

I think I have a couple, if you are anywhere near Atlantic City,

Bill Ditmire Ditmire Motorworks,Inc.

425 White Horse Pike Absecon,NJ 08201

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609-641-3392

FYI

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is a valid URL, which is why I selected what I did. Doesn't mean you'll get spam but it's just a teeny bit closer, maybe.

DAS