So you don't have enough experience with this player to really have a solid read. I often feel like "head phone in, not talking" usually means someone who doesn't know much about poker beyond what they see on TV.
If villain were holding 8
x
, I would have expected a lead or c/r on the flop. Given that the K
game on the turn, all of his K
x
hands are out of his range. What I think is most likely here is a bare 8 that saw the K come on the turn, and is hoping that a bet will win this hand uncontested, because he doesn't want to get to showdown, not because he's trying to get value.
The two options as I see them are calling here, hoping to win unimproved or to spike a
, or raising for value and the possibility of a cheap showdown when you don't improve.
In option 1, you call 30, and will probably have to call 60-75 on the river. There are no cards that can come where you are going to feel comfortable playing for stacks. This option will cost you between $90 and $105 to get to showdown.
In option 2, you raise to $75. If V pushes, you safely lay down. If he folds, great, and if he calls, you're looking at a $200 pot on the river, and a SPR of 1. Again, there aren't any cards that will come where you will feel comfortable playing for your stack, but if V calls, then he'll almost certainly check to you on the river, you can check behind, and get to a showdown for $75 instead of $90.
I would raise to $75 on the turn and reevaluate from there.