Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
You can get replacement pattern diaphragms from the likes of NRP. Not sure how well the originals will stand up to E10 fuel even if NOS.
I don't think that's a crack it's a mould flash mark.Some wear on cam flanks typical of that model. Journals don't look too bad ... again for that model as I have seen some real horrors..May be worth sending cam and rockers to Newman cams for assessment.