[grayskull]

i need help finding out if i ahve a factory 409 ss car.also help figuring out how to decode the trim/acc. tag on the firewall...
:3gears:

 

[77Impala]

Here are two websites that may help answer the first part of your question.

http://www.impalaforums.com/newreply.php?do=newreply&noquote=1&p=3411
This one covers the 1958-1969 Impalas

http://www.goissca.org/imp_hist.htm
This one covers all Impala from 1958-2001 year models