I think the 3800 3.8L front wheel drive V6 has a different bellhousing pattern than the rear wheel drive 3.8 that is used for the swap (Regal motor)

http://en.wikipedia.org/wiki/List_of_GM_bellhousing_patterns


88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride