“IF” I would have kept my J body it would have had a tube k, rack steering and coil overs by now..... that said on the ISO we removed the biscuits and replaced them with steel boxes we fab’ed up. I also dumped the power steering box in favor of a manual unit which provided a little more room for the Hooker Super Comp headers. FWIW I found the Moroso oil pan fit the factory K better, but still required some lip removal from the K.