Speaking as a licensed certified appraiser and Camaro master judge, a CE block is better than a restoration block (dated restamped correct block w/ original numbers) only if you have paperwork from the dealer showing the engine change. Any first-gen high performance Camaro with an incorrect engine takes about a 33% deduct in value verses a car with its original engine. For many enthusiasts, having a replacement engine is not a big deal, for others.....it is. In today's market, the average person cannot afford a pedigree 1969 Z28. If you want to have your car judged in the concours "Legend" class at the Camaro Nationals, it's about a 200 point hit for not having the original engine.