A friend of mine has swapped over to the Edelbrock Pro-jection kit on his big block in his 76 truck. Tuning is not the easiest thing so far. Definetly beneficial to put it on a chassis dyno and play with road load and throttle positions to see where the readings are at and what adjustments are needed. Without that, your simply guessing and your seat of the pants tune is no better than can be achieved with a carb. Tuning is also more involved since you are changing fuel and ignition mapping at selective points instead of an entire curve. He is still dialing it in, so he says at this point he hasn't seen where it is hugly better economy wise than his tweaked Thermoquad. Cold starts are easier and since he off roads the truck, off camber/extreme angle driving is better.