No sir. Some of the factory bellhousings had a dual bolt pattern on the transmission side. One pattern for the four speed, one pattern for the three speed. The three and four speed do not take the same bolt pattern, so they made some with both patterns. They aren't hard to find. ALL of the small block over drive bellhousings I've ever seen had the dual pattern, BUT they also have the 5.125" center hole. Brewer's Performance sells a front bearing retainer with that diameter that fits the stock A230, I believe. Four bolts and it's swapped out. Nuthin to it. So you have more than one option. I think the 4.350 hole dual pattern bellhousings are "a little" harder to find.....but not much. You'll find "somethin" you can make work. Count on it!
