[Ant]

Rick you are right there is a possibility of a bit of fuel and ignition could be very dangerous to my eyeballs etc. I am sure whatever type of air box I make there is available different types of plumbing and I can use alloy lightweight tubing down the engine valve covers or further out going to the air ducts. I made some nice fibreglass air ducts years ago which I used on my FE Cobra to cool the inboard Jaguar rotors these I still have so I could use them even in a position like the 289 FIA cars to do brakes or intake air....!

vector1
I think a lead in to the carb helps, we used a universal spinners 1.5" dropped base with the KN 2ply element mentioned earlier in this post which gave the same result as using no air filter on my Pro-systems 950 which has a nice sculptured entry, but probably not a good experiment. I see a few expensive historic rear engined classic race cars use the Pipercross foam type probably because it is relatively non restrictive, but Pipercross claim their element material is better at filtering and less restrictive than the oppositions cotton type elements......!