[Gearhead999]

As bmxmon said, the intake manifold is integral with the cylinder head on a 250 cu in 6 cylinder. I don't know of any adaptors that mount a 4-barrel on a 1-barrel intake.

There is a company, can't remember the name, that specializes in jucing up 6 cylinders. I'm sure someone on the board will come up with it for you.