That motor is the Oldsmobile 5.0 liter V8; it was used in E-body Rivieras, Toronados, and Eldorados, as well as many other GM cars from the same era. There should be one in your local U-pullit yard that will work.
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Ed Raner
ROA #279
Heartland Regional Coordinator (Kansas City area)
1963 Riviera - Black w/ white leather
1964 Riviera mild custom
1985 Riviera - Dark Blue (stealth mode)
Some days you might have to be the statue, but other days you get to be the pigeon.