No problem Blair.
1) - As Rick mentioned, the "L" in the cowl tag does not in itself prove SS.
2) - No way to tell from the cowl tag or VIN if a 69 Post Sedan is an SS.
3) - It is very difficult to "clone" a 69 300 Deluxe model as an SS, unlike the simplicity of doing it to a Malibu. A certain item on the body should give it away every time. All the clones I have seen over the years do not have it.
4) - Sorry Blair, the only 4346 carb I have is on the car and I guess it's going to stay there. I run an aftermarket distributor and don't have a 499 unit - "GO FISH"
I see the carbs on Ebay quite regularly and they are not cheap. Haven't seen a 499 for quite some time and they are
very expensive. In time you will find them