It's not the aluminum head The alum. head has raised intake ports. That's a 240 or 300. Not a bolt in for Mav. Lots of old school parts still available for those. Buddy of mine in high school raced a '57 ford with a 300. I think it ran mid 17's at about 85. Good enough for lots of trophies in those days (1965-67 stock class). Those things really sound great.