I have a 66 mustang coupe with a straight 6 cyl 200 engine. If I wanted to put a larger engine in...say a 302...what all would i have to change. The things I have come up with are the suspension, the engine (of course), and transmission. What else would I need to change? I've read some places that it's impossible to switch it out because the 302 is too large, but I've looked under my hood and under the hoods of mustangs with V8s and the space is the same size. The main thing I'm worried about is having to cut out parts under the hood to make room for the engine, but from what I've looked at it doesn't seem that I would have to. I've also read that it would cost a fortune to do. I understand that with the transmission plus the engine getting replaced it will cost a little over 5,000. So exactly how much modifying would I have to do to my car? Would I have to get a stronger rear end or get a new rear axle to withstand the power or what? I have a 5 bolt pattern for the wheels so I'm not worried about that, and I have disk brakes...if that has to do with anything...So is there anyone that knows how many things I would have to replace or add? by the way I'm not planning on racing or anything, I just want a more powerful engine.