. Have you priced a WELL MACHINED set of heads ? I still do outside sales occasionally, for a speed shop. (shop owner done Mopar small blocks ,since 1968) Just a basic good valve job/CORRECTLY DONE valve guides/new stock type valves , on OEM Mopar heads usually run 800-1000 bucks, on 30-40 year old iron. The Magnum EQ heads flow more air, have great velocity, & are a 58-59 c.c. combustion chamber. To each,their own.