Unless you are going for a numbers matching situation,I would advise the Keisler Bellhousing its made out of Titanimun and looks just like the 621 and even has that number stamped on it. If the car will see some hard use you might stay away from a used 30-40 year old bell, I found out the hard way.
The bellhousing for sale shown in the link doesn't look too swift to me. It might be a bad picture, however the bolt holes for the trans look real flaky from my perspective. Plus, I think he's asking too much. I paid $100 for mine and it looked almost brand new. If you want an old one, I say keep shopping.
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