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John,
Did not know that there were part #'s (3967477) w/o the GG. Don't know what the application would be for that. A Chevy BB solid lifter A/T application in 1970 was . <font color="blue">
3969894GP </font>
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Sam, here is a no "GG" 4557 ..
http://cgi.ebay.com/ebaymotors/ws/eBayIS...bayphotohosting
The orange 70 L78 Camaro on ebay also has a non GG carb.
http://cgi.ebay.com/ebaymotors/1970-Cama...1QQcmdZViewItem