68 Cuda 383 vs a 360

Hold up, last I knew 426 was the max you could go with a 383? (which brought much more appeal, for me, to the effectively small block 383) Who has a kit for this? Or is it a piecemeal operation?
I don't think there's a kit, closest would been the 470 kit from muscle motors & change pistons to a 4.280 or 4.310