I found some Jaguar 3.8 rod data:
Length 7.75"
Big end bore 2.233" (292 is 2.225"), would need an undersize and a smaller undersize on the crank.
Piston pin .875"
Width 1.180"
Based on 292 deck height, the piston CD for zero deck (quench distance is gasket only) is 1.065".