1966 Barracuda 273 Valve Covers Querie

Can anyone tell me if the HiPo 273 Valve Covers with the nice aluminum cooling fins are compatible to use on the standard (non Hi Performance) 273 motor? Some one told me that the 273 HiPo motors had adjustable rocker arms vs the regular non HiPo motors and that the HiPo valve covers are dimensionally smaller inside & would not clear the standard rockers???? Thank you. Eric