Well, that's more like it. 150 is ideal but 140 isn't bad. Looks like you haven't killed it yet, lol. That's the good news. The bad news is it isn't running as well as it should. I'd start by going through all the basic tune-up stuff again - timing chain, valve settings, and timing - yes, timing. Even though an electronic set-up is supposed to be "set and forget", many times a few hundred miles after install things can change slightly. I don't know if it's new parts settling in or what but you may find the timing not quite right now.
If all that checks out it may be time to look into the carbs again. Just because you haven't re-jetted, it doesn't mean the P.O. didn't. But if he did, he may not have done so correctly. These carbs, especially the '78-'79 set, usually require a bit more than just upping the main jet size.