Look for a 02 or newer if you have to go with the 2.7L. They had a few updates, such as the waterpump and gasket, along with the Tchain with a different amount of links, updated oil pump with more capacity....
I got rid of my 01 Concorde because the PO drove it miles with coolant in the engine, and dumped gallons of coolent in to the oil.. That inturn made the T chain tensioner fail, and lose timing.. I was going to fix it, but to do it was MORE then the car was worth... I called 6 shops, and 5 of them told me to junk it.. They dont want to turn down bussiness, but the engine are ALOT of money, 1500+ for a used one, up to 3K for a newer one with the updates... then the $110 an hr.. The Timing chain, and WP kit alone was over $1000... And that is just the parts, to install it in a engine that was mixing coolant is not a great idea.. i cant take the gamble..
So if you can pass DO SO, or look for the 3.2L or 3.5L..