No one in their right mind would race the nose heavy Volve B30 engined car, when the better balanced B20 engined car was more suited to track work, so homologation in period is yet another red herring. That effectively rules mine out as getting an FIA Appendix K label, even though it is standard in all except wheels and brakes, because they weren't homologated for racing in period.

Homologation is not the current issue here. Fitting period parts is. So does that include fitting a period engine or not? Is an engine a part of the package?