Hi Peter,
Great pic of your engine. I can clearly see now why mine is causing trouble. Your intake manifold drops away at the side where as mine is square.
The dimensions of your scoop are much higher than mine. Mine is 20mm above the bonnet. Sounds like yours would do the trick.
I have a great offer for you. Lets swap bonnets, mine just needs paint.
Can you confirm for me that this was a standard item you purchased from DRB? How long ago did you get it?
If possible I'd really appreciate a side on pic of your bonnet.
Regards
Cameron