Yes. There are occasional issues with the non-thrust-plate blocks--ESPECIALLY when using a thrust button that hasn't been properly clearanced--where the timing gear digs into the iron of the block, gouging the block and screwing-up the fore/aft placement of the cam.I have seen non-roller blocks with so much wear that the cam actually scores the rear block plug
This looks REALLY bad when the block is pulled apart for rebuilding.
However, any decent machine shop can cut the gouged metal out, and press-in a bigass hard valve seat insert large enough to go around the cam bearing. The insert is machined to match the face of the block, if needed (but if the machinist does his measuring and cutting properly, there'd be little need.)
Once there's a huge valve seat insert in there, just TRY to wear-out that section of the block again.
Another method--preventative rather than restorative--is to drill a tiny hole from the front of the block into an oil gallery, so that pressurized oil is squirted onto the back-side of the cam gear thrust surface.
You must be registered for see images attach
This "shouldn't" be needed, because that surface is already lubed by the oil bleeding out of the front of the front cam bearing. OTOH, a little more can't hurt.