I like what he's shown but the only way to find out is to get this kid into game situations and let him try and handle the pressure. If he is going to be a good QB its probably at least 3 years down the road and might entail some NFL Europe.
But I will say this. He's not the most accurate strongest arm undrafted guy I've seen. Kurt Warner is. Which brings me to my point. Warner...Fiedler...Garcia. Garcia and Warner are probably the two best active fantasy QBs in the league. Both undrafted. The bottom line is that in the NFL there just isn't an accurate enough system of scouting to find guys that could be good NFL quarterbacks. And if I remember correctly, Levcik was the starting QB for Joe Walton's team which ran a pro style offense, a conservative one at that. Remember that the reason Chris Chambers slipped is because he was in run-oriented offense and caught a lot off play-actions and etc. Had he played in a run'n'gun or fun'n'gun or some kinda wide open offense, yeah he probably would have had unbelievable numbers and been a top 5-10 pick. Kurt Warner ended up going to a school where his talents weren't exposed for the world to see. Hence he went undrafted.
So the precedent is there, the line of logic, and then he's got the things you're looking for in a great QB. SIZE. ARM STRENGTH. Apparently he's got great DEEP ACCURACY. He seemed to have good intermediate accuracy as well. He's got great TOUCH. Former NFL Head Coach Joe Walton swears by the kid, a lot like other coaches were swearing by Fiedler and like Bill Walsh was swearing by Jeff Garcia. So far Levcik doesn't have his head into the playbook enough, and doesn't have quick enough feet, and seems to make bonehead moves sometimes.