I was North. I decided not to preempt initially because of my side 4-card major and poor quality of the ♠ suit. My partner agonized at his second turn and finally passed, presumably influenced by the fact that I was a passed hand. As you can see, it makes 4 or 5, depending on whether the opponents get their ♥ ruff.
I was thinking about other actions. I could have doubled, to keep ♥ as a possible contract; if partner bids ♦ I can correct to ♠. That might also make my partner think that his ♥ holding is a useful secondary fit, and maybe he would have raised. The field (a club game) was about evenly split between 3♠ and 4♠ contracts (4 part scores, 3 games, and one pass-out). Since our opponents did find the best defense, we only beat the pass-out, for 1.5 MP on a 7 top.

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-- P 3♣ P
P 3♠ P