Saab 99 Minilite look alike will fit the MGA. Should be able to find a set of those at a modest price if you are allowed to use them that is. Your "racing" wheels sound as if they are fit for the bin. If the centres are off-centre there is no cure and you will be lucky to find anyone who can straighten them if otherwise OK. They can be spun up in a big lathe and forced back in line but you then need to heat treat them as well or they will just go back to the previous shape. Look for better wheels. Late MGA/Twin Cam but not knock-offs. There are also some expensive Dunlop wheels for the MGA.
Class rules for wheels will probably apply for the PV but you might be able to getaway with early solid centre 1800 wheels which are 4 1/2".
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