most dipsticks are accurate to within a quart,,,,don't forget the size of the oil filter you put on is going to govern the amount of oil you need to add,,if you put the filter on dry.
Just a quirky thing with me left over from my day's as a heavy duty mechanic(diesel) i alway's fill my oil filter(priming) up before installing,,,even if it's a side mount,,,messy but never had a problem due to oil failure.
And a quart of oil too high will not bother a 350 either,, in my humble opinion.