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Agree with shlby 66. Speed cost money, how fast do you want to go. "IF" you ever think you might evolve to any vintage race organization that...
If there are no rules....maximize the cubic inch and keep the rpm down....I'd start with a later 302 block and at least a 302 crank...lots cheaper...
I have several pictures of the car in Walts shop...I think they are all from the side. As to the grill, I would imagine it still has the 65...
The car Walt drove in 1965 and 1966 is R103...it is a 65 that was up dated in 1966 to 66 specs. SCCA B/P specs allow updating for production cars...