What reason did GM pull this ad for, what year was it and what issue of what magazine was it posted in before it was pulled?

Heh-heh! That signage is a little confusing.

What reason did GM pull this ad for

Because it appeared that the driver was waiting for someone to come along to race. GM did not want to promote illegal street racing.

what year was it

1968

and what issue of what magazine was it posted in before it was pulled?

Either MotorTrend or Car and Driver

What year was the ad in. The car was 1968. Be specific. What magazine issue was it in? Month and year and magazine name. You were very close though and you got the right reason.

Thats a great ad . I am going to find one a frame it.

It would be very hard to find. It only appeared once before it was pulled.