I used to get vapourisation in my Bv8 years ago, but only at the MoT when it was standing for a while at tickover. I laid a mat of woven insulation under the carbs which helped a bit, but I also looked at fitting some sort of fuel return with a higher pressure pump. It could be done, but would need some trial and error I suspect.
On my Morgan, where both fuel lines run close to the exhaust, I've sleeved them with insulating weave, and up to now have had no trouble.
Hest sink is the issue, so even a fan ( blowing at the carbs) which runs at tickover and immediately after switching off might help. There are options if you look at fans used in IT systems, or competition cars.
