Against a straight or a set my equity is slightly smaller than 30%. Should I call nonetheless because his range of hands could be wider?

Gulf of Honduras 10475004-83450 Omaha Hi/Lo Pot Limit $0.50/$1
Hand Start.
Seat 1 : alexkong has $16
Seat 2 : vv junior has $94
Seat 3 : MattSk has $277.47
Seat 4 : Blue-Moon has $92.38
Seat 5 : triker4 has $99
Seat 6 : marcuse has $72.25
Seat 7 : Livia*Starr has $51.62
Seat 8 : andkrav has $51.62
Seat 9 : pokerlisa has $71.50
MattSk is the dealer.
Blue-Moon posted small blind.
triker4 posted big blind.
Game [83450] started with 9 players.
Dealing Hole Cards.
Seat 3 : MattSk has 3[c] 2[s] 8[c] A[s]
marcuse called $1
Livia*Starr called $1
andkrav folded.
pokerlisa folded.
alexkong folded.
vv junior called $1
MattSk called $1 and raised $5
Blue-Moon folded.
triker4 folded.
marcuse called $5
Livia*Starr folded.
vv junior folded.
Dealing flop.
Board cards 8[d] T[c] 9[s]
marcuse checked.
MattSk bet $10
marcuse called $10
Dealing turn.
Board cards 8[d] T[c] 9[s] 2[h]
marcuse bet $35.50
MattSk called $35.50

I don't understand the flop bet, what hand would bet 2/3 of the pot there that raises PF? A27J? If you're going to cbet a flop like this I'd just pot it and really find out where you're at.

On the turn, I think I'd fold because the stack sizes and being in position make it such that you're not going to be able to blow him off his hand if you make a low on the end. If you were OOP I think a call would be a better play since you could potentially fold out a weak str or set by potting when you river the low, and because a bet in the case of the 4-out fill would look like a bluff to your opponent.