here's a tricky situation from 5/5 PLO

[kirisim]

In a live 5/5 PLO game, I was the big blind with a 2356, no suits. There was a $10 straddle and a bunch of callers. I called the extra nickel. There was $60 in there preflop.

Flop is 347, with two spades, giving me the nut straight, with no redraws.

Small blind checks, I bet pot ($60). One caller behind me, small blind calls. Pot is $240.

Turn was an offsuit nine. Small blind checks. I pot it ($240.) The guy behind me folds. Then the small blind wakes up and raises the pot. It’s another $720 for me to call. Holy [censored], that is a massive raise.

I started the hand with about $1800, and the small blind had about the same. So if I call the $720, there is still lots of money to bet on the end.

I also thought it was obvious he had the 56 as well, so my odds are only 1-1 on a call. However, I do have position.

What's my play here? And should I have played this hand differently?