20-40 stud hand

[afish]

I'm trying to figure out stud. I played 20-40 stud for around 40 minutes at the Taj on Sunday. Before I get to the hand, I should comment that I was one of two players under 60 at the table, and I'd say that three of the players were closer to 80 than 70. I'm not sure there's going to be a large group of living stud players in ten years.

Anyway, to the hand. This hand might be straightforward, but I have a couple questions.

Third street:

A 3 brings it in. An 8 raises. A ten calls. I have 6s7s in the hole and 8s showing. No spades, 4s or 9s are out. One 5 is out and one ten is out. I call. (is this correct?). The bring in calls.

Fourth street:

The raiser gets Qs (making his board 8xQs). I catch 4s (making my hand 4s 6s 7s 8s). The ten gets a 9 and the 3 gets a 5. The Q 8 bets, the 10 9 calls, I call (should I have raised?), and the bring in calls.

Fifth street:

The 8Q player and 10 9 players catch blanks, and the bring in catches a 6 (making his board 3 5 6). I catch the 9c (making my hand 4s 6s 7s 8s 9c). It is checked to me, I bet, the bring in calls, and the other two players fold.

Sixth street:

I get Jc. The bring in gets a 9 (making his board 3 5 6 9). I bet and the bring in calls.

Seventh street: I catch As (making an Ace high flush). I bet, the bring in raises, I reraise, and the bring in calls.

Comments welcome (particularly on third, fourth and seventh streets). Results to follow.