My 2019 who is 6'6" 210 went to one showcase at 14 yo. He was 6'4" 190 and threw mid to upper 70's at the time (although he is 1B/RHP). He fell right into the mix with every kid out there and had nothing exceptional to show, other than his "projectability", mechanics and command (the last two are expected not praised).
Unless you light up the radar gun (low 80's at his age), hit the ball 400 ft., or run a 6.5 60, and/or any combination of those measurables, you are wasting your time at a showcase. Even at smaller local events, there will be 80+ kids trying to grab attention. Very few actually do and at 6' 170, he will blend into the rest of the crowd. It seems to me that unless it is a high profile "invite only" PG type event, you will be wasting your time.
Check velo and speed (60) at your local training facility and understand that elite 14/15 year olds do actually throw 85-90, hit the ball 400 ft and run sub 6.7 60's. Make sure he is on the best Summer team he can play for. Not just make, but contribute. Identify your weak areas and get after it throughout the next year. At 14, the sweat equity he is willing to put into his game will let you know how serious he is, before you get too serious with the checkbook.