$0.50/$1 No Limit Hold'em Cash, 5 Players
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Hero (SB): $132.63 (132.6 bb)
BB: $63.58 (63.6 bb)
MP: $111.55 (111.6 bb)
CO: $156.38 (156.4 bb)
BTN: $60.47 (60.5 bb)

Preflop: Hero is SB with 9 9
MP folds, CO raises to $3.50, BTN folds, Hero raises to $11.50, BB folds, CO calls $8

Flop: ($24) 7 8 3 (2 players)
Hero checks, CO checks

Turn: ($24) A (2 players)
Hero checks, CO checks

River: ($24) 8 (2 players)
Hero checks

Villain is a tag that is rather on the passive side according to is wwsf.
I thought about my xcalling range here and Im not sure if I want to block clubs here or not ? In general I would think ppl use spiked fd's on that turn to balance their valuebets and dont check behind clubs without SDV.
In this spot blockers seem not relevant or am I missing something ?

Depending on how you construct a passive TAGs call 3bet range OOP CO vs BU, they may not be relevant at all...we block 910cc, J9cc, Q9cc, K9cc (but unlikely he has ALL these combos in his range anyway always) ... so ya at face, I don't think your 9c blocker is all that relevant either.

Good hand to xc OTF. Double backdoors give your hand playability on later streets & you do very well against a stabbing range on this board texture that favors CO's range. River is just a x.