66 Dart GT HT Whatsitgonnabe?

Heads up!

I might have an opportunity to buy a set of J heads for $250 here in Sweden. I don't know more than this (actual casting number or valve size, ported or not).

Is it a good deal? Not sure what to do with them, though. I haven't run my engine yet. :D

Until you know all the particulars you mentioned, hard to say how good a deal they will be. Have they been magged for cracks? Do they need to be rebuilt? J heads might be a hard to find item in Sweden so they could be a good deal but not be any better than what you already have on your 360 - valve size, already ported, etc. Have you checked to see what you actually already have?