hey Adrian,
I don't think you are right on that. If you flip the 7 and 6 around you have it. you don't have the correct angle inbetween "cyl7 and cyl1" & "cyl6 and cyl4", they will be way out then.
strange thing is that you do have the order of the A collector 8352 right.
it doens't matter if the whole collector is turned (counter)clockwise for ease of installation. as long as the pairs are the same, you will then gain maximum on scavenging effect.
@ Edward,
I saw you PM on lextreme, but am not able to show anything as I went on building the car with a GM engine. I believe Errol Richardson is able to provide some input on this matter. he's on there named RMS or Richardson Motorsport.
regards thomas