one problem with "antigue" insurance is they usually limit miles per year. so, if it's your daily driver, it wouldn't be pracitcal. my friend with a restored 72 Chevelle has cheap insurance even though it's a 600hp 502cu in . he is limited to about 2500 miles a year.
i use Farmers which the agent is my friend and i get it a lot cheaper than Progressive was.
just my experience.
r

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Current money-pits:
96 Passat TDI
78 300D 100k miles(60miles/day)FOR SALE
91 Jetta Diesel 250k miles (80miles/day)
82 Toyota Diesel pickup 150k miles; out of service for a little while with a valve problem.
All on BelenBioDiesel
Past diesels:
01 Golf TDI
81 Isuzu P/U
85 Jetta
89 KW 425 cat
85 Pete 400 cat (currently still running the west coast with over 1.5 million miles)
81 KW 400 Cummins
77 Freightliner CO ???? Cummins (Buttercup)
57 180D lots of miles(gone but not forgotten)