I just sold a '69 fresh, standard bore, 428 CJ w/ CJ heads, Cobra
oil pan, Cobra valve covers, flywheel, complete front end, 427 dual-point dist, hi-volume
oil pump, spun alum pulleys and complete 427 low-riser dual quad intake w/ new 600 cfm carbs for $5,500.
However, just saw buddy get $6,000 for rebuilt top-oiler 427 here in Miami, Florida. Check it out on eBay under completed items search.
Whatever you do, get it from or rebuilt by an experienced FE shop.
bob