I have a friend who has a toy...he has had it for a lot of years...it's a '63 Chevy Nova, and he is getting ready to put a new engine in it...I think he said it was 565 and will run in the 8's.
Sometimes, those toy habits all consuming..at least it runs in the family!
It sounds like your kids are a reflection of you. Good for them. (And good for you!)