Since it's the same bellhousing as a 360, with a Novak or AA adaptor, any OD trans that bolts to those will work on a 258. They have one for a 700R4 IIRC.
1979 Chero S "Sundog" 1979 Chero S "Hammer"
1968 327 J3000 1978 J10SWB
The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over.
Hunter S. Thompson .