woodydat,
yes I think the centres may interchange, but the overall width of the housing (drum to drum) will be bigger by about 90mm (or thereabouts) Therefore your Bluebird housing will not only be too wide without flares, the spring platforms will be too wide apart. You would have to get them relocated to match the narrower spring width. Not impossible but not a 5 minute job either! As for the bluebird struts, the spring platforms have to be removed and 1200/stanza ones welded on. Also might be an issue with bottom arms and ball joint angles but other posts have covered this in the past I think. Much easier solution is to use stanza struts and have no drama - you get the same brakes without the headaches! Not claiming to be an expert here but bolting up is easier than cutting up! Good luck.
Cheers
P.S. Before I get chastised - the H190 has 10 bolts, couldn't remember at the time