I moved to Pennsylvania from IL about a year ago and have been putting off registering my car. I can't make sense of the PA registration... antique, collectible, street rod, etc. My car is a 1959 Chevy Bel Air... lowered 3" with a 350 and cosmetic changes (grille, paint, etc). It can be registered as an antique and not require inspection, but should it be registered as a "collectible" car if it has been "substantially modified". The "substantially modified" definition doesn't seem to apply to "low slung 50s type cars" but seems to be based on engine swaps... but a 350 isn't substantially different from the 235/283/348 available in 1959 models. Any advice from PA folks?