Gary, you are unlikely to find out much about entry list from Masters as they never publish in advance. You could email them and ask, though. Legends sports cars, Lurani FJs and HGPCA are also racing there.
On a personal note, I will be there in Touring 70s- In the best traditions towing car behind Vito for the 3500 mile round trip.......... (OK, tradition would suggest I drive it there, but it ain't road registered so
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Anyone else?