198 slant questions

I’ve read lots of threads on how to identify and basically you can’t . My car I believe to have its original 198 in it . I snapped my studs off in it trying to replace my intake and exhaust so thinking I’m gonna just buy one. But no one seems to sell a head for 198 specifically. I’ve not seen on the threads about anyone talking about any head differences on the 3 slant engines. Does it matter ?