My 197 has the 265 engine, and 225 box, running 320/340. The Engine/box/intercooler were fine, many other problems encountered, all now sorted, and car runs well. The 265 engine/225 box, will fit easily, the 250 box would fit, but needs bulkhead cutting, to get a good fit. Run the 225 rad, its has a larger capacity than the 197rad. A few people have overheating problems mine were overcome, after finding fan was blowing the wrong way around. I has sensor problems, all now replaced. Its easy to fit 225engine/box, and tune to around 280/300 torque, much more, and its best to forge. 250 engine goes to 320bhp easily, 360, with turbo change.