Snowy,
The Bandito was sold in different configurations, a 350 and 360,one as a scrambler with 21 inch front wheel and scramble type handlebars knobly tyres, the other was a TT bike with a 19 inch front wheel and dirt track tyres ,different clip on bars and a more HP cylinder.The model you have has the boatail,the next model had alloy mudguards Just about all that were produced were exported from Spain,mainly to America. They were sucessful in TT racing and desert racing.
The engine as you have seen is very robust (heavy) the gears (4 speed) are bigger than some used in a truck!! but they are also a reliable engine when set up properly.
Parts are readily available for them. Might pay to look into the couple of gears needed to change from Montadero to Bandito ratios if you plan to race it seriously? as the Montadero gears can be a bit too widely spaced for Mx use, but you do get used to it after a while.
My Montadero has engine no 70 00231 and has been a good reliable, racing? hack over the last few years.
PM me if you need any more info.