How much does it cost for an engine for a 1989 buick regal custom?

Mine has 145,000 miles on it,and im thinking about fixing it up nice. I just want a standard engine nothing fancy,or real expensive.How much does it cost for an engine for a 1989 buick regal custom?It will cost more to buy one, then replace it then the car will ever be worth but it`s your $$$ Try this site for a price, http://www.car-part.com to see what they are going for. Good Luck.How much does it cost for an engine for a 1989 buick regal custom?Leave it alone, it doesnt need to be rebuilt yet