LOL,...I am a PMO distributor and tall manifolds are ALL we sell & use.
One must use the insulators between the heads and manifolds to deal with the volatility of pump gasolines and their propensity to boil over on heat soak.
Like TimT, I've been driving a carbureted 911 for 25+ years and if they are installed and setup properly, its as bulletproof an induction as there is,.....
