"Is there as max vehicle miles per year restriction with Collector plates?"
There is a subsection that presents another set of conditions to apply under, this is the only one that mentions miles per year restrictions. I'll post the whole text and bold the section I'm referencing, it won't be the one that I try to register through because I don't meet the other qualifications, but I won't be doing that many miles anyway.
About: Vehicles must be (a) Model year 1975 or earlier; or(b) Model year 1976 or later that was registered as a collector's item prior to September 1, 2009; except that a vehicle so registered is not eligible for registration as a collector's item upon sale or transfer to a new owner; OR (c) A model year at least thirty-two years old unless the vehicle was registered before September 1,2009, and meets the requirements of paragraph (b) of this subsection (2). if the vehicle is being registered under this paragraph (c) and in the program area, as defined in section 42-4-304: (i) The vehicle must have passed an emissions test meeting the standards of part 3 of article 4 of this title within the last twelve months before being initially registered by the owner as a collector's item; and (ii) The owner must sign an affidavit DR 2839 that the vehicle will not be driven on roadways for more than four thousand five hundred miles per year. All taxes and fees shall be five times the annual taxes and fees normally assessed.
The last sentence scared me a bit but I guess if I'm good for 5 years then the 5x taxes makes sense.