I bought the 1979 Hatchback in 1996 and dropped a well built 400 c.i. Pontiac engine in it followed by a beefed up TH 350 trans with a 2400 RPM stall converter.
The 1977 Landau was purchased in 1999. It has a 305 Chevy engine and TH 350 trans. The body needs rear quarters welded in, they are all filler now.
The 1978 Landau should be mine by next spring. It is still in Arizona waiting for me.