Yep, it definitely depends on the club. Mine is very strict on mods. A chrome air cleaner won't be tolerated unless it came with one standard.

I was at a show a few years ago and there was a nice FC sedan with 7"chromies, lowered, triple SU's, sports steering wheel, etc, etc,... and it was on club rego. The owner said it was typical of cars in his club. I personally liked it and saw it as a "period correct" car, but it certainly doesn't fit in with the rego guidelines.