I am missig the cover plate at the bottom of the bellhousing. It is a 350 with a 4spd standard transmission. What is it called and where can I get one?
The cheapest way, by far, is to get them from other 1979 Chevy pickups. You knew that, right?
You can actually make money by buying a 2nd 1979 Chevy pickup, and selling everything you /don't/ want one piece at a time. You'll get your parts for free plus you'll probably have $500 extra when it's all over.
