Agree, the short individual intake runners make the problem much more pronounced than. Interestingly although we don't have a reversion / stand off issue when we switched to the Holley we still have a breathing issue which points to headers. Over winter our plan was/is to switch to a cam which has a bit less duration , which we see causes the problem, and a bigger lobe separation angle which should also alleviate it. If we swap our cam and the issue is alleviated we'll report back. May also put engine one dyno and swap out the existing headers for the 1 5/8ths we use on Mustang and see what that produces before embarking on having any made.
GT40's run "turkey trays" so at least you stop the drips getting onto exhausts - that's then theory anyway and I was told if you see flames hit the throttle and it'll suck them into the engine.... okay...
Hopefully not hijacking the thread but we got confirmation today that our car has been given an FIA Historic Passport (with the Webers on) but not as a GT. Basically it means (unless the race organisers are "flexible" which in current climate they may be!) we have to race against Lola's, Chevrons, GT40's and 917's which is, (to put it mildly) complete BS and a kick in the teeth. We'd hoped it would open the door to lots of races and planned on going up against E Types, Griffiths Cobra etc but no, not according to the FIA we won't. According to them it's not a GT but a Two Seat Race Car. Utter nonsense.
So another reason we may not race the Mangusta but having come this far with the IDA's we are stubborn enough to try and get engine to work properly on Webers whether they are IDA's IDF's or DCNF's!!