That is about 10 degrees larger than what I'd recommend for someone who wants to cruise on the freeway in OD but it sounds like you got it working.

I have a 246 cam in my 512 and it is okay on the freeway in 5th if I'm running 70 mph or higher. If I hit slow traffic and have to drop down to 50 or 55mph then I need to downshift to 4th gear.

So freeway cruising in light traffic is one thing, navigating a crowded freeway might be another variable. In Portland the freeways can clog up most any time of day so you always have to be ready to slog your way home. A cam that is too big just makes a bad drive worse...