inner arch is quite easy for a decent fabricator to make up repair panels, you could also look at buying the standard n14 inner arch panels & cut them into repair sections perhaps .
FR sport have oil pump & expect you could get cp rings from them too all in one order.
I would go with cosworth gasket & be sure head & block nice smooth finish, victor reinz gasket not bad quality or price for more standard lower power builds.
Cams come down to what you using/building car for, what power & what condition your current ones are in. If you got standard cams in A1 order & use car for road the standard cams are good, I would look at some porting work to head, standard exhaust manifold & a 3" elbow. HKS & Tomei do good cams if you need them for your build .