I just bought a 1976 seville with 15,600 original miles. For starters It has a mint interior and barely any rust anywhere. However, parts like the fuel tank and radiator have been rusted out from the inside from sitting liquids, so I have to replace them.

I have been wondering, since this car is "brand new" visually and drive train wise, is it a bad idea on my part to put in parts that would not look OEM?, like an aluminum radiator or making the exhaust sound better. Would this look bad for me at a car show, and would I lose points if I was competing?

Visually I am trying to keep this baby as close to factory as i can, but I have hit some snags in the process finding the right parts.

The air filter cover has the original stickers on it but it has multiple rust spots that have made the paint flake off. I can't find the stickers online so I can get it repainted and replace the sticker.

On one side of the fender, it should have two emblems that read "Seville" and "Fuel Injection", but I am missing the "fuel injection" one and have been searching online and junk yards for a Seville with this emblem on it but with no success.

I had a radiator shop tell me I am better off buying an aluminum radiator because I can get them for $100-$200, unless I want it to look OEM because the core would need a full rebuild and they would charge about $400 for that.
I have found black aluminum radiators that look similar to the one I pulled out, but they only offer one row of coolant tubes, and I am unsure of their build quality. I have found Welded aluminum radiators with 2-3 rows for $200 but they are a simpler box shape and come as polished aluminum finish (yet still looks nice). If anyone has one of these older V8s, have you had any problems with overheating with an aluminum radiator with only one row of tubes? And should I be worried about having a radiator that does not look OEM? I would install it no questions asked if I was not worried about how others would feel about the look of the engine bay not matching OEM.

What the side of the fender should look like with the "fuel Injection" emblem.