Not all years had "V-tec" stamped on the valve cover, I think '92 was one of those years, oil fill on the V-tec valve cover is back drivers side corner, non V-tec is passenger side front of valve cover.
This looks to be a stock VX engine that I found a photo of online, O2 sensor is a 5 wire (except CA sold VX's that have a 4 wire o2 sensor) o2 sensor is right under the dip stick I think that the o2 sensor placement and catalytic converter placement right under the o2 sensor are only found on the VX, the VX also has a small air intake compared to some of the higher HP engines, there is also the engine code number stamped on the block, D15Z1 right under the upper radiator hose on the engine block.
This is what you want to avoid, header or other over sized exhaust and crazy huge air intake both are hard on the engine and will kill your mileage while causing weird vibrations and increased wear.