I worked on these for the best part of 17 years. I think I may have an operators manual somewhere. I can probably help you in some way, what do you need to know about the machine?
The CVA 8 is a screw machine, but it's not a swiss type. The bar stock is fed to a stop through a collet with a feed finger on the end of a feed tube and then clamped in a fixed position. You can drill, roller box turn and tap from the six hole turret. You can machine with flat or circular form tools on the cross slides and part off with the overhead slide. Some of these machines had a pick up attachment which picked the part up from the cut off tool and swung it away to a back working attachment which could be a slotting saw, a nut tapper or a back drilling/chamfering attachment. There was also a bevel gear turret drive that could drive live tools in the turret, such as counter rotating live drills and milling attachments.
The main spindle had a three position clutch which could be set to give fast and slow, fast and brake or fast brake and slow. The fast could be forward or reverse running so you could drill with a left hand drill in fast and then forward in slow to get the tap in then fast in reverse to get the tap out. When the spindle clutch was in the centre position the drive was disengaged and a spindle brake applied so you could do spindle stop work such as cross drilling or milling etc.
These machines had a few weak points, namely the spindle bearings on the later Mk III machines had very little adjustment for play, wear in the spindle clutch toggles and wear in the bronze worm wheel on the cross shaft drive. If you kept them well oiled they would run high production for a long time.
Are you intending to get it into production? If so did it come with any tool holders for the slides and the turret? Any cam sets? Any cam blanks?
First off you will need to know how to make the cams, or know where you can get them made. I used to make the cams on an almost daily basis. I devised an Excel spreadsheet to make the calculations easier, mark them out with dividers and a centre punch, then blank them out on a band saw and finally cut the rises on a cam mill.
Drop me a line if I can help.