adjusting calling standards to a tilter, 2/4 nl

[Surf]

Villain in this hand is not a good player to begin with, but a series of beats / stackings (i c-c, c-r'd a set turned quads and he stacked off with QT on a Q858A board, calling a 3/4s psb rvr push)
have [apparently] tilted him pretty hard. He dumped a big pot to another player at the table 15 hands ago, and the very hand before this he reraised my $12 open and a CC'er to $175.

eff stacks $350

I pfr to $14, folded to tilter who calls in the SB. At this point he could be playing, well, anything.

Flop: J[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/heart.gif[/img] (pot: $30)

Tilter checks, I bet $20, tilter c/r's to $60.

Now, I need to make a decision on the flop, because i'm 95% sure he's going to bet himself allin by the river with his entire range of holdings, he's in meltdown mode. What's the minimum hand that we can / should be calling here? IMO calling is best if we're not folding since it will induce multi-street bluffs.

Surf