I am trying to convert my automatic to a standard on my 71 Chevelle. I have installed a 3899621 bell housing with a 10.5" clutch assembly on my small block 350. I believe the flywheel is a 168 tooth. My question is that my starter nosecone won't fit into the bellhousing or bolt up? I compared the nosecone to one I took off a 350 standard truck and it is identical. Is it possible that the 621 bell is only for a big block or is something mismatched with my flywheel and/or starter. Can anyone check the flywheel P.N? I bought the flywheel at a swap so I'm not positive its right. I thought 10.5", 168 tooth was all I needed?