UTG opener is 27/20 Reg, 61% fold to 3bet, with 13% UTG openraise.
Blinds are Regs but rather tight and not too squeeze happy.

SB Villain is 26/20 8% 3bet, have huge sample on him

He usually plays as a midstack which is the reason he has such a weird stacksize, but from time to time he plays 100bb+ as well.

He donkbets flops 18% of the time, and donk/folds 20%.

1) Do ou think the preflop call is ok? Just called because we are a little bit deeper. Normally I would fold against that tight of an UTG range.

2) SB has quite a high donking range it seems, so he definately could have  lot good draws in there as well as all sets. Maybe sometimes QQ.

Do we ever not call flop and turn here? Should be the best against this opponent IMO

3) SB's overall bet river is 34%, WWSF is 45%.

This may seem hes rather not the guy to make big riverbluffs, but then hes basically only repping 66, 33, JJ which is 5 combos. I cant really see him having a backdoor club flush there ever.

That being said, do you guys call or fold river?

I have no idea if the range I stoved is anywhere near being realistic...
Board: 6h3hJc7c6c
    Equity    Win    Tie
MP2    33.33%    33.33%    0.00%    { AsJs }
MP3    66.67%    66.67%    0.00%    { JJ, 66, 33, AcKc, AcQc, KhQh, KcQc, Th9h, 9h8h, 8h7h }