i have a nice set of stock untouched original high performance heads that were only used on the 67 to 70 high performance 396 and 427 engines.they are the large oval port cast iron heads.the casting numbers are 3917215.the date codes are L 12 7 and L 15 7.that means dec 12th and 15th of 1967.these are complete with valves and springs and screw in studs.they could be put on an engine and run the way they are.valves,seats and guides are very nice.a steal at $600.vic 250 443 1964