Aren't Engine Quest heads made in Queensland? I don't think paying to have them sent overseas twice would be very economical. You've got an advantage, there. You may want to check some local suppliers to see if you can get them direct.
My friend up in Golden, Colorado purchased some of them for an LA 360 for about $850. What he ran into was an issue with coil bind on his cam, with the 1.6 rockers and his cam. I'll have to get the cam specs. He ended up running beehive springs.
If you run LA valves, the Magnum valves and retainer locks have a different groove height, so you need to get those measurements and parts to fit. He ended up using Magnum valves with magnum style locks that he spent a bunch of dollars on at a dealer and told me that if he had to do it again, he'd go with an LA style valve lock and groove valve.