I talked with a Lycoming service rep earlier this year about engine sumps and fuel distribution. He agreed that the carb engines with horizontal intake sump have better fuel distribution to the cylinders than the vertical sump, so I have a Rotec TBI unit I would like to try on a front sump RV-4 to get that ram air and better fuel mixture at a lower price than 'real injection'. The problem with these mods is job stacking, as the existing crossover exhaust is in the way. So this is my wife's plane, and taking it out of service for change out of sump, carb, exhaust, and fiberglassing a custom air inlet is not well received.
I might try it on my T-18...