I bought the car from a woman a few blocks from my home, It was given to her when her 91 father past away. It sat in her garage for 6 years when I bought the car. After driving it for a few weeks it started leaking from rear mains, trans, power steering, radiator and rear. I had the engine and trans pull by JMS Racing Engines in El Monte, CA. When they pulled the engine we found out it was a 289 hp C5AE-6015. The engine was .30 over and in great shape, JMS installed rings and bearings, seals and rebuilt trans. Is the car worth less because the engine does not match the VIN number? Should I replace with the correct 289 225 hp?