Nice score on the Abarth cam. There appears to be no fuel pump lobe and the lobes are narrower so would have been intended for an engine with stroker crank. The lobes also appear to be pointier. Cam looks to be in great condition too.
Another way to reverse engine rotation other than changing from a 600/A112 to 850 cam or vice versa is to use a reverse rotation gearset that replaces the stock timing chain. The gears simply bolt on and very easy to do. These are still available. They are allegedly noisy though.
A problem with cams of unknown history is there could be a "flat" lobe or new bearings might be needed and IIRC, can be hard to find someone to do it nowadays. Easy to use calipers to check to see if the intake/exhaust lobes all measure the same. Failure to properly do a startup procedure on a freshly built engine can quickly destroy lobes on a good cam.