yeah i agree with 98coupev6. With the money you would spend on the engine swap, why not just buy the Prelude or any other car you want. It is not cheap for a complete engine swap, but if you still want the swap, it's gonna cost you... To answer your question, most obvious positive effect will be the power gain. Even though it will be faster than your current stock accord, but it will still be slower than a stock accord. With all other factors being equal, the weight difference plays a huge role in the performance. So if you want a faster car, just get the Prelude. Of course, this decision is still up to you.