'68 Barracuda Notch

I knew my motor burned a little bit of oil, so I went and checked it today. It was two quarts low and I just did an oil change on it about 300 miles ago. It's not leaking out anywhere, so a quart every 150 miles seems pretty catastrophic. A rebuild is certainly not in the budget right now, so I'll be spending a few more dollars on a quart of oil every gas fill up.

Do you know where the oil is coming from? Could even be a PCV issue...