I have just completed a restoration of my original 427 FE side oiler after having issues with exhaust valves and low
oil pressure. I got rid of the original heads, original cam etc and went with an Eldenbrook package, roller rockers etc. The package with assembly was approx. 10,000. It runs better than ever, sounds great and runs stronger than prior. The engine is quite rare. If the fellow would allow a mechanic to look at it and esp give you a refund if block issues are present it could be a go for 6500. Original heads were great in their day, but by todays standards are heavy with fair flow. When we first built this engine in 95 originality was my dream, but no longer. Est. 525 hp conservatively now, but haven't dynoed yet.