Engine options on this car ranged from a 302 Windsor V8 up to a 400 Cleveland V8. The car was intended to retain the sportiness of the Mustang II whild maintaining the luxuriousness of the LTD.
This car only sold well during its first year. In 1978, sales dropped dramatically. The Dodge Diplomat
and Chrysler LeBaron were strong competitors for the LTD II, perhaps too strong.
No car officially replaced this one in Ford's lineup, although the Granada was similar in size and the LTD was downsized to a midsize car during its final years.
You can find the LTD II car in used car classifieds, although usually not in much abundance. You'll have better luck searching on eBay. They have a ton of car parts on there as well, both used and new.