On the flop, you need to call 250 to win a pot of 1000, so you need 20% equity to break even. However, you are not last to act, so the pot could get bigger, it could get raised, and you are only paying to see the turn, not turn and river (so pure equity does not apply).
Let’s assign villain a strongish range, like top pair plus (75s/44/66/88/99/TT/JJ/QQ/A8/K8/Q8/J8s/98s/87s/86s). You have 30.4% equity against this range, with most of your outs being improving to top pair ahead of 8x hands. Only a 7 is a straight out on the turn, and there are no flush outs. I think it is fine to call because you are getting a good price and have overcards to beat top pair. The turn really helps by improving you to a flush draw and double-gut straight draw (J or 7), which increases your equity against villain’s assigned range to 38.7%. None of these equity calculations are particularly meaningful though, because it is a multi-way pot.
It is not possible to determine exact EV because there are other players in the pot and you don’t know villain’s hand/range, but I think your overall play is fine (apart from the preflop min-raise), though passive.