Texas to Central Am/Caribbean
If I remember right, the 29 and 30s (special) were very similar boats with the 29 being slightly optimized as a race boat with an open interior layout. That should not affect the price all that much. I strongly suggest that you have the boat surveyed because the potential problems with these boats can far exceed their overall value.
As to an engine choice, I am a big fan of the Yanmar 2GM. You should be able to find a rebuilt one pretty cheaply.