One thing to remember is that the 351 block has a taller deck height so the motor is taller and wider. This means that things like headers and exhaust may need to be modified to fit.
You may be better off sticking with the shorter deck 5.0 block and building a 347. These combinations will make some great power. I've got the tickford version in my ute.
http://www.keithcraft.com/item--331-...e_331_347.html
http://www.keithcraft.com/item--347-...e_347_363.html
Cheers