Actually, you may find that there are a few major problems with doing this. Weight being probably the most important. You are going to be adding a large amount of weight to the nose of the plane. You are going to have to find ways of adding weight to the tail to compensate for this, which would probably end up being adding lead to the tail of the plane. Now you are increasing the overall weight of the plane which in turn increases the wing loading. The increase in wing loading increases the speed you will need to take off with, as well as causing faster landings.

Another thing to think about goes along with the increase in weight, and it deals with the structure being able to handle the increase in weight and power. It's possible that you could literally pull the firewall off of the airplane unless it's probably strengthened. This goes for the frame of the plane too. Will it be able to handle the extra weight and power?? Only two ways to find out. 1) pull off the covering and inspect the framework. 2) Fly the plane and see if it comes apart in the air.

Now don't get me wrong, I'm not saying that it's not possible to put a larger engine on this plane. I'm just saying that there are things that need to be taken into account when done. People put larger engines on planes all the time, but most of them have the experience needed to do this safely. A discussion such as this is usually above the level of experience of new pilots in the hobby.

Some things to think about.

Ken