Man you should have said you have an 82. How was i to know? I thought you were lost. I know what MB Quarts are, i know they sound good, they aren't THE highest quality speaker, i know the 4" is for mids, i do have a clue. But just because they are three way doesn't mean they are better. Some of the best quality systems have five speakers. Two tweeters/horns, two mids 6 or 8" depends on the horn, and one sub. A wise man once said, it is one thing turning a cow into a hamburger, but it is different turning a hamburger back into the cow. Is a set of four way 6x9s going to sound as good as a set of similar priced two way 6x9s?
If it was me, i would put the 4" and tweeters in the kick panels, and trade the 5s in on a pair of 6s because they will have better midbass response. And put the in the door. Otherwise just stick the 5s in the door. If you really want a kickass system, go to your local install shop and tell them you want custom kick panels and door pods, and a custom boot install for your pair of 12s? 15s mabye? Add two big amps and start entering a few shows to see how it does against others. Should do well. Good luck.