Hi, it is better to make a new cam support plate that has 4 mounting points. The 3 point plates have been known to move and break off the centre mounting stud. They are simple to make, copy the shape of the existing plate then fill in a section for the last mounting point, making sure to clear the oil pump. If you have an old ventilation disc, they can also be copied by someone with a lathe.
When fitting the support plate be careful that the bolts/nuts are correctly tightened beneath the support first and shim the plate so it fits flat. If everything is not flat, you can crack the timing/ intake cover very easily.