Yep Prud, that was the V6 Capri, reploace it with a steel timing gear OR don't rev it past 6,000 OR live wth the bang. The later engines are much harder to get power from after 200hp, they start off stronger out of the box (leter version, injection etc) but hit a brick wall at 200 ish. The essex is a heavy lump, about the same as a 289 but being more compact, it doesn't have 2 cylinders hanging over the front axel line like the V8. There are a few popping their heads up in Group C again, it was the first car Glen Seton raced at Bathurst with his Dad, Bo, and, Mr Fairlane, I have heaps of their old race stuff if it would help you get your project going, we haveput Bo's old Bathurst motor into a customer car and just fitted tripple webbers, mildish cam and 168hp at the rear wheels. PM if you like.