I think converting to a six is a stupid idea that makes no financial sense whatsoever.
I have prepped my car for the increased horsepower and am now patiently looking for the 'right' engine/parts opportunities. I'll wait for at least a fresh 2.7 or 3.0 or 3.2.
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-- Dave
Pics of my '73 project here:
http://members.tripod.com/mike4g/dds73_b4pics.htm