There's a truck for sale in Kansas that has one of the Ellis manifolds.
http://www.commercialtrucktrader.com/listing/1952-GMC-10k%2B-113365067
More carburation helps at higher RPM and at full throttle. At lower RPM, more carburation can actually cause a flat spot. If you were going to drive it like we did over 50 years ago, it would probably help. My gas GMC was rated at 232 HP and with more carburation, it did better than that. And it ran circles around 671 Detroits. But for a vehicle that you are not going to run full throttle, I would say that all you have is a good conversation piece. These were low RPM engines. And if you run them at higher RPM, they won't stay together.
