Tripes is leading Sun; who's 33?

Here's what I love about having this Retro Motocross blog:  I have the shots...you have the memories.  When I can't remember the details (which is becoming more frequent) you can fill in the gaps.

Here's a shot from Daytona; it's Marty Tripes (7) carrying speed and pacing ahead of Chuck Sun (63).

Who's #33?  And what is PDQ?  I know what we called that acronym as a joke, but I need the facts!

Thanks for helping me relive some great years in my life.