Only married couple to compete in a nascar race?

May be...

I believe Elton Sawyer and Patty Moise also competed in a few Busch Series races as well

Frank and Sara Christian
Daytona Beach Road Course
Sara 18th
Frank 6th
"first" race ever with a female driver, and there were 3 of them.

Edit: Okay, I was off a little on the bonus question, in my defense it was 2 a.m. when I answered..

only one married couple has ever competed in a nascar race, and only once...

1) who were they?
2) what race was it?
3) how did they both finish?
4) bonus: what other nascar "first" happened in that race?

Wow - That is the reason why Winter Glory is a top contributor. Amazing!

Frank musta been cheating with magnets or his oil lid fell off or something!!