Turned nuts faces board-pairing river with around 40% pot behind...

1/3, $500 max BI, 9-handed, Friday night. Rake is 10% up to $5, plus $1 for high hand and $1 for bad beat, once the pot exceeds $10.

High hand promotion of $500 every 1/2 hour, and bad beat for quad 6's or better.

Reads - hero just recently joined the table, and has played 3 hands - got caught bluffing once and lost, folded before showdown once, and took down a pot without a showdown, leading to a debate about whether or not I had it or I was bluffing (I had it).

Some of the table talk when hero sat down centered on my taking 2nd in a tournament held in that room 2 weeks earlier, and some strat discussion. Based on V's comment about the table talk, he was paying attention, and so he shouldn't think hero is a losing player, even though I lost 2/3 of the pots I've played so far.

Main V / BTN - $475 effective - never seen him before. Late 30's / early 40's white guy. Based on his VPIP/RFI and limited table talk, he seemed fairly solid, not expected to get too out of line, too often.

CO & HJ - I forget which one joined the party here. Both were loose-passive pre, but TAG post. Both on somewhat short stacks. Neither is overly relevant in this hand.

Hero - early 50's WG, new to table. Per the above, probably not perceived as being terrible. A little over $500 in my stack.

OTTH:

Folds to hero in LJ, who opens $15 with Tc9c. Either the CO or HJ flat calls. Main V on BTN 3B to $50. Folds back to hero who calls. Call from CO or HJ behind. Three-ways to the flop with $150-ish in the pot.

FLOP ($150) - Jc8c5d.

x, x, BTN $50. Call, call.

TURN ($300) - Qh.

Hero leads for $150. Fold. BTN calls, with $225 left behind.

RIVER ($600) - Qs.

Hero?

Check-call? Check-fold? Bet? Size?

Should I have folded pre? Should I have played the flop as a check-raise or donk-lead? Should I have donked bigger on turn, or jammed, or played it as a check-raise instead, or just a check-call?