many ways to find out.
www.teamdelsol.com FAQ for one
JHM is the start of the VIN number for VTEC models, so it's not a VTEC model.
Check the redline. Si models redline at 7200. VTEC models 8250 94/95 and 8000 for 96/97.
Engine block stamp. D16 Si model b16 VTEC model.