I think I have once. My 226 with the HD 3-speed was going to a car show up the coast and I decided to take it on I-295 cause it was early Sunday morning. Figured I could do 45-50 maximum without annoying anyone. Everything was going great until I got pinched at an on-ramp with a truck carrying a bunch of old household crap that wasn't tied down and was a high risk of things falling out and hitting me as he picked up speed. He lost a couple of light items right away and didn't seem to care or realize it. I couldn't go slower because I was beginning to have cars tailgate me. So I went into the passing lane and gave it all it had to keep up with that lane's cars. Was supposed to be temporary but ended up doing that for about a mile.
I thought for sure that engine would blow a rod out, or the 4:86 ear end would detonate. Maybe both at the same time. Didn't do my blood pressure or nerves any favors either.
Probably did burn off a bit of carbon though.
It was a dumb choice to take the highway.

I'd sure like to do a 4:11 gear swap or 60 conversion some day. For now I just stay the heck off the fast roads.
Tom