So I have a 1970 Ford Maverick with a 250cid and an automatic 3 speed transmission. Since I have money and time I can put on the car, I am going to drop the 3 speed and put a t5. Will this affect any other part in a bad way? Pros and cons? I want to keep the inline 6 since I drive it everyday and its not as loud as the v8. Yes i am goin to put headers but after i tune the engine.