CHP, Coast High Performance, has been doing modular Fords for along time. Here's a rotating assembly for our cars, that will slightly lower the CR for forced induction cars -
http://www.coasthigh.com/Ford-5-0L-C...5002-ps-4v.htm.
If you want a full on shortblock, try this one -
http://www.coasthigh.com/15002-PS-F5...-f5.0l-asb.htm