Your car is going to run like crap! For one thing, you'll forever have a check engine light because the ECU will assume the automatic tranny is just failing to respond. Also, I'm not away of any DOHC VTEC ECU's that are automatics and would plug into an OBD II ECU plug so I'm guessing your planning to reuse your DX's ECU. Not only will that ECU not have the VTEC activation point or VTEC fuel maps (you'll be stuck on the small cam the whole time), it will probably hit a revlimiter at least 1000-1500 rpm before the B16A is ready. I don't believe it will damage the engine in anyway, but it will handicap it to such a point, the whole swap was probably pointless.