I hope your mechanic meant a B16A swap and not just the engine because well the engine itself goes for about $500 but it's pretty useless without the matching short geared transmission (and VTEC ECU). So assuming he meant the swap, well it's a tradeoff but a lot of people do it. More power, less torque. A JDM Integra XSi supposedly runs a mid 15 sec quarter mile, like a GSR, but who knows. I'd probably do it if I were in your situation.