Used to get it a lot 20 plus years ago,when I built up my Chevy LUV,with 350/350,etc..But it was usually at the second set of lights that it happened,,maybe cos it didn't stand out too much,and by the time I rumbled on to the next set of lights,,everyone heard the gentle rumble of a V8,,so everyone wanted a race..Upset them a bit when I ignored them..
The next time it happened was when I got the Monaco on the road,complete with stroked B/B..Same effect.. Doesn't happen now,in the ol'F100 work truck..