just seen photo of your engine, I have removed the distributor on mine.
One thing I considered using as a scoop was an upturned oven tray as they are a range of sizes.
got it from ebay
size wise its
410mm across the front
530mm at its widest point towards the back
530mm front to back
6omm at highest point at front tapering down towards the back
My engine sits 40mm above bonnet
The scoop needing a bit of fettling as the fixings had to be glued and a bit of plastic webbing removed
HTH
cheers Paul