You can check hagerty.com for their Valuation Tools, it's free and provides current and historical trends for classic cars.
Without seeing some pictures and knowing more about the mechanical and cosmetic condition of the car it's hard for us to offer any input. Post some pictures and describe the operating condition if you want a useful opinion.
And...if it's really what you want, in a condition you're comfortable with, and you can afford, then go for it! That's what I did with my '68 3 years ago, and I've never regretted it.
'68 GTO, 400/TH400, AC/PS/PB/PW, hideaways, Hurst dual gate
'72 442 'Vert, 350/TH350, AC/PS/PB/PW
'74 Corvette, 383/4-speed, 450 hp, restomod
'71 Javelin, 304/3-speed
'70 Cougar XR7 'Vert, 351W/FMX auto *SOLD*