Yes, that is a possibility. The OP hasn't provided us with enough information to solve the problem. (which of course is the main issue on Moparts. But to be fair, if people knew enough information to help us solve their problem they could probably solve the problem themselves in the first place)

If it was my car I'd return the carb to stock and start my testing over again. If the car works just fine everywhere except for WOT then I'd suspect fuel delivery. A fuel pressure gauge would be the first thing to add. If there is plenty of fuel pressure but the engine still goes lean at WOT then I'd try to find the next choke point in the system. Could be a clogged filter, a kinked line, a blocked off power valve, etc. Lots and lots of variables.