As far as I know the pedals shouldn't rub left to right even if you mixed and matched. When I first built my 46 the clutch pedal rubbed. Little heat and bent it back in line. Not sure how it would have gotten bent but it was also an abandoned project so maybe something happened when it was laying around. The previous owners were going to 350swap it so I'm sure they weren't too careful with the stock bell housing. Now one other thing to point out- mid 46 there was a change to the brake pedal and if you don't have a matching set of pedal and pushrod your brakes will be screwed