On the ford forum I frequent there is a complete Tickford TE50 5.6 motor with ECU for sale. These are the last of the windsor motors that were stroked to 342 cubes and had a bunch of special goodies in them. 250KW and 500Nm from a factory motor.
It'd be a great Cobra power plant.
The bloke wants $6500 for it.
(NSW) Part T3 5.6 litre factory stroker motor - Australian Ford Forums