Holley 94 ECG, rebuld but problem

[Cheaterpete]

On my 286 ci stroker I use to run brand new edebrock 94, unfortunately cfm is too low, and decided to buy 2 rebuild ECG that flow 195cfm instead of 155 for the Edelbrock

Install 46 main jets and bolted on, car fired up right up, revs perfectly when not in load, then I decided to drive it

first gear and go, but the engine is strugling, no power, if sounds that there is no fuel, or no ignition, put the clutch pedal down, and the engine is reving with no problem, tryed a few miles, but no power fell weird...

Any ideas of the problem?

thanks for your inputs

Peter