Got my old transmission out, and am starting to put the new one in. My engine is brand new, but my old flexplate fit fine. The new transmission is an SM465 out of an 89 K5. The hole in the flywheel is too small to fit over the centering piece on the crankshaft. I guess i need a new flywheel? also- are the bellhousing bolts (bell to engine) the same on the TH350 as they are on an SM465?