i have a 2.4 bottom end you can throw your dohc head on and throw insome srt pistons/rods which would make a strong long lasting motor good to hold 200/300hp all day everyday no problems....the auto will hold you back swap it to a mtx. i have a spare acr tranny which is awsome for whatever your needs are but it has a welded didd so you would probally want to replace that with a stock one.