Looking at the picture that does look like an early style follower so it follows suit that it would be an earlier style cam.later followers are like the new one pictured with a line around the body near the bottom.early ones again are softer and should only be fitted to earlier cams.have a read of the haynes book.preferably one for a 4 cylinder as found in mk1 cav,ascona,manta or early carlton. This explains quite good the differences.i have seen quite a few esrly ones worn but never the later type.contributed to by lack of oil changes ? ?.later heads had a different style of front cam bearing journal too and had NO oil groove in it.therefor a leter cam can only be fitted to a later head or else oil starvation to the other cam bearings,followers and rocker studs will happen.my opinion now before you get any bits is i eould source a later head from 85 onwards marked on the side with a 'p'. And rebiuild and fit this(grind in valves,new stem seals). It will be better also because it will then be Fully unleaded compatible.which pre 85 heads are not in the long term.