Okay, so this is a year-old thread, but I came across it searching whether my 740 was an interference engine. I've been following BB for several years and was pretty sure the 8-valve B230 was non-interference. However, my son has a 1999 Mazda Protege and I had never been able to find out what type it was searching the web. Today I found a Gates site and a document that said it was non-interference. However, when I looked up the 1992 740 engine, they say the exact opposite!
http://www.gates.com/common/downloads/files/Gates/TimingBeltReplacementGuide.pdf
WTF! Where would Gates get this recommendation?
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1992 745 approaching 500k km
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