4/7 swap in firing order..

Here's the best information we have at this time.
1)The advantage is in the fuel distribution onto cylinder #2. In the conventional firing order 5 and 7 pull fuel to the back of the engine and then 2 pulls to the front at the opposite end. This became a problem in BBC because the number 2 and 7 cylinder ports are long. 5 helps 7 pull to the back then 2 tries to pull forward and gets lean. You do not see this on 1 and 8 because they are short runners. By revising order (swap 7 and 4), 8 helps 7 and 4 helps 2. Thus, your fuel distribution is more balanced between cylinders.
2)Helps equalize EGT across the board.
3)Works best with 500+cid/7000rpm+ packages. +/- 1% on the dyno.
4)Reduces crankshaft deflection (jurys out on that one)
5)Has been used in Cup/Busch/Craftsman but unconfirmed information has it that it has been outlawed, stock firing order only now. Don, perhaps your contacts can shed some light on that.
6)I have information that some restricted intake class builders have had very good success with the 4/7 cams. That seems to go against the grain but I have heard it from more than one source.
7) Flatter torque curve.
A few points for discussion. Fire away.