Throtle Body port matching

I have a 99' ex with an AEM CAI, JG Edelbrock Header, Random Technology 3" cat, and a Tanabe Catback System. The car sounds really good right now but i really want to replace the Throtle body because heard it can give your car an even more agressive sound at wide open throtle and of course gain a few horses. Now there are a couple of things I wanted to know. 1) What is the size in mm of my current throtle body, i had trouble finding this info. 2) I was looking into holley throtle bodies one being a 62mm and the other being a 68mm. Both are going to require Port matching of my intake manifold. I plan on evetually getting a Jackson Charger so im not sure if i have to take any of this into account. Which is the better size for me to get, personally i always go with the bigger is better strategy but that doesn't always work. Ive never done any sort of port matching, is this going to be hard for me? There any sites with any port matching guides or anything? Ok enough questions you guys get the idea.