is there a <p> height

there is "line-height: **pt"

however, a P tag will automatically wrap text to boundary width so if you have one word too many, it will wrap to a new line, that will then make your paragraphs uneven heights.

To help combat this you may need to add "word-spacing:*pt" parameters in for each paragraph depending on their wrapping.

...
short of that, i'm all out of ideas

Your <p> height will be determined by the pitch and kern of the font. You can set:

.p
{
  margin-left: 10px;
  margin-right: 10px;
  margin-top: 30px;
  margin-bottom: 30px;
}

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If your margins are all 10 px then change your .p to this:

.p
{
  margin: 10px;
}

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I think there is even spacing you can apply. CSS is extremely powerful find this on the web shouldn't take you a monumental effort.

first answer of no