A couple years back The 12 Port News had an article on Marv Wiegand's Austin Healy with a crossflow inline six. He built an intake manifold with runners angled downward so the carbs flowed uphill. The stock hood fit.
Once again: a LOT of fabrication.
I'm not saying it can't be done. I'm saying it can't be done easily. It's not a bolt-in thing.
It's too much for me to try when better results can be had by adding a turbo charger or nitros to the 250. Sure you can do the same to the 292 but at that point are the gains worth it?
...but if he wants to do it more power to him. I'd even lend a hand if it were local.
