Hello, My name is Jeremy King and this is my first post. I’ve had a 1973 SBC 400 sitting is my garage for about 25 years and finally got around to rebuilding it. When I was finished, I went in search of something to put it in. I found a 1980 Camaro with an excellent body and solid chassis. The 229 V6 that was in it was running but not very well. It seemed like the perfect car for my project. I’ve done many SBC swaps and rebuilds over the years but, until now, my experience with transmissions has been mostly limited to the TH350, TH400, and a couple of PowerGlides. I have replaced a few clutches but always in factory correct cars so I’ve never had any problems. Here’s the problem I’m having now: this Camaro has a 3-speed Saginaw manual and the bellhousing is too small to fit over the 168-tooth flywheel on the 400 small block. Like I said, I don’t have much experience with manual transmissions and didn’t know there were different sizes of bellhousings. I’ve done some research and it looks like the GM 621 bellhousing is what I need but before I spend the money on it, I want to be sure I’m not going to run into any more issues and I have some questions. Are all Chevy 4-bolt manual transmission mounting patterns the same? Will the GM 621 bellhousing have the same depth as the current one? Will the clutch fork be in exactly the same position and work with the existing clutch pedal linkage? Will the SBC 400 starter fit properly in this bellhousing? If I install the GM 621 bellhousing, are there any issues I may run into other than the questions I’ve already asked? I realize that the 3-speed Saginaw, the 2.73 rear end gear, and the SBC 400 are not the best combination for this car but I will deal with that sometime in the future. For now, I just need to get this Camaro back in drivable condition. Thanks for any advice you can offer.