I recently did this to my 250, it's in a 67 Chevy C20. I followed the advice in the Inliners tech section for T5 almost exactly and it was very helpful. THe one thing I wish I had done differently is I wish I would have purchased an adapter plate so that I didn't have to cut down the inout shaft and the throwout bearing tube. Obviously I cut them down and it works fine, but it would have been easier (but more expensive - $150) and then I could have used a complete clutch kit from an 86 Astro van and I wouldn't have had such tight clearances on getting the clutch setup properly. But in hindsight, I saved the money and the trans was just what the doc ordered. I cruise at 70 mph at 2400 rpm's and I have plenty of power spare to pull any highway grade at 70 mph. Also, don't be intimidated by the process described in the tech info for getting the clutch setup. If you can measure with a ruler, it's not as hard as it it is described. Good luck.
