[whateverpratt]

It works fine. My truck has the original 230 with a leaky 1bbl, 30 inch tires, and a 3.73 posi. I haven't tuned it (points plugs or anything) in about 10 years, and I drive it probably 5 to 10 times a month (not usually more than 30 miles in a trip, though I did take it on a 400 mile round trip and it did fine). My engine doesn't like to rev over 2000 rpms, so that's my only limiting factor right now as to speed. If I would tune it, I imagine I could get it going pretty fast.

As it sits right now, It will do 60 very comfortably (the engine's sweet spot seems to be in the 1800-2000 rpm range) and 70 if you push it a little, but I firmly believe this is due to my lack of engine maintenance. Peak horsepower numbers on these 6's were at 4000 rpm, and I don't think mine would rev to 4000 unless it was in neutral. In short, if I would put a little effort into tuning it, I think it would do 80 without any strain.