The AGPR12PP8 are MOTORCRAFT(FORD).
The CHAMPION are just that champion.
As for gap I would use 0.6mm unless you have a group a coil, if not get one well worth the money, got mine from MATT LEWIS £32 delivered 01922 692424.
Then experiment with the gap as you should be able to open it up a bit, group a on mine(stg1) made idle much much better and improved low down imensly pulls a lot harder at lower revs, general running a lot smoother too.
Both plugs available easy enough, most places sell them.
tabetha