My insurance agent guided me well along those options. If you're going for a PA registration as a classic and find it's less expensive to register, then you betcha there are restrictions unfortunately, both by the state and insurer.
http://www.dmv.state.pa.us/pdotforms/fact_sheets/fs-ant.pdf
FACT SHEET
Antique, Classic Vehicles and Vintage Registration Plates
PURPOSE
This fact sheet outlines the policy for issuance of antique, classic and vintage registration plates.
DEFINITION OF ANTIQUE AND CLASSIC MOTOR VEHICLES AND VINTAGE REGISTRATION PLATES
Antique Motor Vehicle - A motor vehicle, but not a reproduction thereof, manufactured more than 25 years prior to the current year which has been maintained in or restored to a condition which is substantially in conformance with manufacturer specifications.
Classic Motor Vehicle - A motor vehicle, but not a reproduction thereof, manufactured at least 15 years prior to the current year which has been maintained in or restored to a condition which is substantially in conformity with manufacturer specifications and appearance.
Vintage Registration Plates - A vintage registration plate is a “period-issued” registration plate from 1906 to 1975 to be displayed on an antique or classic vehicle with the same corresponding year of manufacturer. Vintage registration plates are not manufactured or issued by PennDOT. Applicants are required to provide the vintage registration plate they wish to display on their antique or classic vehicle.
USE OF ANTIQUE, CLASSIC AND VINTAGE REGISTRATION PLATES
The use of antique, classic and vintage registration plates is governed by Section 1340 of the Pennsylvania Vehicle Code, which states: “It is unlawful for any person to operate a motorcycle or vehicle with antique, classic or vintage registration plates for general daily transportation. Permitted use shall be limited to participation in club activities, exhibits, tours, parades, occasional transportation and similar uses.” Occasional transportation and similar uses is defined as one day a week.