In that same thread referred above was a link to charts showing cold pour ratings. Which is more important than weight for cold starts. I'm changing to Amsoil 20x-50 Zrod today based on those readings. I you like to drive the car even road conditions allow. The car is stored in the garage so it's never THAT cold of a cold start.
Found it:
http://forums.maxperformanceinc.com/...d.php?t=764086
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Adam
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1964 LeGTO
469, M21, 3.42
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Sold:
1968 Pontiac LeMans Convertible
See it go
HERE