Tom, there hasn't been a rodeo built with a timing chain since 1992 (GM 3.1L V6) I assume you have the 2.2L 4cyl in your 1999 since you crashed your valves. None of the 3.2L V6's are interference engines. Isuzu put out a TSB for the 1998-2003 2.2L to make sure to change out the timing belt every 60Kmi. Sorry to hear about that man! That motor is toast. I had heard that dealers keep 2.2's in stock for this very reason.
G/luck
Joel