I have a '72 El Camino with a ZZ3 (340 hp / 350) crate motor and an ART CARR 2004R overdrive trans. The trans is equipped with a 2600 rpm stall converter with no lock-up. The 12 bolt posi has 3.73 gears.
I would like to change to a less aggressive stall converter WITH lock-up to try to get better than the 12 mpg I now get.
Will a lock-up converter handle the 340 hp motor? What stall speed converter should I use?
Thanks for your comments.