I am building a COPO clone, factory Garnet red car. I have bought a ;69 Dated 427 BBC, it is the 512 Block, has 840 heads, and motor is ALL there except for crankshaft. I got it at a reasonable price. But it will obviously still need machining, and may have to purchase new pistons depending on what it cleans up at. I will still have to buy an intake, GM winters are HARD TO FIND, carb, distributor, water pump, pullies, and manifolds. Which if I go Original are gonig to be HARD TO FIND! I know a guy who has dealt with GM ONLY parts for 30 years, he is VERY TRUE TO HIS work and does an EXCELLENT job, and has some SUPER RARE PARTS, 302 DZ Crossram intakes (2), 8 DZ blocks, 2 COMPLETE 427 '69 Camaro motors, and probably the HARDEST TO FIND PART for a '69 AN ORIGINAL Aluminum 427 Block, its orignal with the Witners snowflake and all. Well anyways he has a 427 COMPELTE, already assembled with correct, EVERYTHING built to GM specs, 11:1, has correct oil pan, balancer, timing cover, EVEN bolts are correct, 840 heads, 512 block. Motor is SUPER NICE and has been dynoed and comes with paperwork. He wants $8,500 for the motor OR said he would allow me $3k for the 427 shortblock I have and take $5k CASH between. Which would be the better route? I know what my head is saynig but not sure what my wallet is saying..... Also what difference in Value would the TRUE 427 69 motor make compared to the 390 horse 427 that I have? This guy has some SUPER NICE STUFF, 2 69 Z's and 3 69 Big Blocks, 2 396's and one 427. He sent me pics of a COPO clone he built 3 years ago, ABSOLUTELY AMAZING, it sold for $64K and yes it was a CLONE, frame off rotisserie, and EVERYTHING was GM correct for the car!