For those who are interested this is from http://www.crownvic.net/
The 4.6L VS the 5.4L engines dimensions are as follows:
Bore X Stroke in inches -
4.6L: 3.552 bore X 3.5433 stroke
5.4L: 3.552 bore X 4.165 stroke
Bore spacing is the same for both engines at 3.9370".
Connecting rod length is as follows expressed in inches.
The 4.6L SOHC engine used in the passenger cars used a nodular crankshaft. All passenger cars (except a few 4.6L WINDSOR Crown Vics from '96-'98) had press fit pistons pins while the the truck engines (WINDSOR) had full floating wrist pins.
The 5.4L crankshafts are forged steel. The story is, the connecting rods were "beefier" on all the 5.4L engines, but I haven't compared any myself.
These guys sell stroker kits etc.