if you are really into BMW sixes, the why not a big six, M30? Bulletproof, plentiful and you have a choice of a super simple reliable EFI with just 1 ECU or...can be carbureted like the earlier ones. The I6s are silky smooth and give you a wide power band. Metric Mechanic offers great support for them too.

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)