Welcome to the board! There's nothing wrong with the sixes at all. There are quite a few speed parts out there for the 3.8 and the Small Ponies Forum here on Mustangworks has some very knowledgeable six owners. If you haven't checked it out yet then take a peek and start learnin'!
Try
www.californiamustang.com as a start
Brett
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66 Tahoe Turquoise Coupe
Laser Red 96GT Ragtop
30 Years & 30 inches apart in the driveway!