I'm like GMCPanel in that I have more questions that answers. What is a 229? I'm quessing it's one of the many engines GM has called a 3.8 and is that the same 229 used in the Buick Grand National? Didn't that engine have a carb prior to '84? That would have a mechanical advance HEI setup, wouldn't it?
What ever.
A '75 and newer 250 inline should have the same shaft length. From the underside of the plate on the top that the advance weights sits on, to the bottom of the tang that drives the oil pump is approxamatally 10 5/8". The top of the gear is 2 15/16" above the bottom of the tang. The shaft diameters are all .489" from the top, down to the bottom of the gear. Below that some are smaller and some have a flex joint.
