Found a 1972 Datsun 240Z in a barn. How screwed am I?

Okay so I wasn't even looking for a project, just helping a friend clear out his grandpa's old barn and there it was. 1972 240Z, been sitting for probably 20+ years. Body is surprisingly solid, minimal rust from what I can tell, interior is completely gone though. Engine isn't seized, turned it by hand.

Friend's grandpa passed and the family just wants it gone. They're asking $1500.

I've never done a full resto before, just basic maintenance on my daily. But I've always wanted one of these and the price seems almost too good.

Am I about to ruin my life financially? How much should I actually expect to sink into something like this to make it driveable? Not looking for concours, just a fun weekend cruiser. Any advice from people who've been here?