If you are looking for a sbf look at something out of an 85 to 93. You can find a roller engine out of a Mustang or 89-92 Lincoln,LTD,Crown Vic. The 90-92 Lincoln Town Car was the highest HP of the 5.0L at 240. You can also find them in some of the later Explorers and they had the best heads. When looking for a engine find a car with lower mileage that was in a accident and was written off as you know the car was running at the time. You should be able to get and engine and trans for $500-$750 as there are millions of them around.