Reds & Greys have the same bellhousing bolt pattern
so it will bolt up, its just a matter of using the appropriate accessories.
Is this a
Hydromatic or Turbo
hydro you are refering to?
Holdens went from a Holden pattern*(Hydromatic, Trimatic, 3&4 speed manuals)
To Chev pattern*(Turbohydro 350/400)
As far as I know*, some trimatics can be for either one, but not both.
*= I have been wrong before
And if I am, feel free to educate me too
Come to think of it,
It was the 308 block that could be had in either bolt pattern,
not the trimatic.
Cheers
Jeff