To make sure you get the correct pan here's a chart I found. You need to tell everyone here what year A body you have.
#394 A,B,C-Body '67-69
#294 A,B,C,E-Body '70-72
#228 A,B,C,E-Body '73-74
I have the #228 (340), '73-'74 A body.
As far as I know they all interchange, maybe someone else can verify??
treblig