1985 eldorado engine replacement?

Howdy folks ,I blew my 4.1 liter last night i need to know what would be a good replcaement 350 chevy , 5.7cadillac ,6.0 472 cadillac ,New or remanfuctured ?I'm in Texas ,i need your advice and an engine store factory thats good . a service center would put the engine in for me .Thank You Regards, Cadillac Dave