1969 camaro, SS 396 with that predates X- Codes

[RW69camaro]

What are the identifiers of an original 1969 SS396 convertible. My cowl tag appears to predate the x code system. I would like to add pro touring suspension and dont want to devalue it if it looks like it may be original! It has front disk which appear original, no A/C and it has been repainted multiple times and does not have the black tail lite pan.
Thanks
Rob

[1968RSZ28]

Rob -

Read this for starters...  http://www.camaros.org/diffs69.shtml

Paul