Which Tx can you have OTR? Probably all AT T8s T7s and maybe all KT? That's quite a lot so your range is well protected, no need to call for a split with hands that block hearts.

If you have a read/note/stats that this guy is one if those recs who attacks every check with ATC it's a call. You need 21% equity to call and it´s always to split the pot so he needs to be bluffing 42% of the time right?

id just call price too good vs rec to be looking to fold imo

Villain dependent spot.
Despite price being too good, we are assuming he is bluffing some part of this range, but this is total assumptive.
I don't know, but I'm more incline to call a 50%psb rather than 37%psb. It seems that for the half pot, the fish is trying to at least tell a better story...
But as I said is totally villain dependent since there are aggro fishes and the passive ones.

I would cbet this flop and then i will continue on the hurts, 7 5 T K

I think you're just getting quite nice odds to call, it's $10 to win $13.5 and they could be picking any random crap to bluff with or maybe their hand just got counterfeit, idk the sizing doesn't really scream straight to me and given it's a rec they tend to be fairly face up. Against a reg I think we should consider folding because regs really don't like bluffing for small sizes because they know they get called quite often whereas recs see it as saving money when they get called. Honestly I think either decision is fine and calling is fairly close to 0ev either way so it's not that big a deal and getting this spot marginally more right is going to have 0 effect on win rate.

Easy call, good price.

you should call your whole range against a fish here (and raise nuts indeed)