Pre-flop: As you say, it's marginal. But, I don't think it's terrible. With 3 limpers that include a very loose opponent who will pay you off if you hit, and with position, you may have just enough to call from the CO with J8s.

Flop: My first reaction was that your overcall was not good at all. I still think it's marginal. Assume you have 5.5 outs (straight outs could be tainted, though, as could BDFD), giving you 7.7-1 on your draw where immediate pot odds are 5.25-1. Maybe you're right that you will make up the difference with implied odds if you hit. I'm not super confident that's true. And redraws are available against you, which means you really have less than 5.5 outs.

Turn: I don't mind the bet because at ~3-1 you have 33% pot equity, and are likely to get at least a couple of callers.

River: I agree. Nice fold.