I would stay away from anything you have to drop the engine on to change the plugs... That said, if you really want it for it's uniqueness, go for it but realize what you're getting. If you just want a really powerful 914, I'm sure you can build a pretty potent 2L that would rival or exceed the power of the 6.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250