1966 2.0 resto 901/01 ali engine case or 901/03 ali case??

[Shaq3000]

I'm in the process of restoring a 1966 2.0 SWB RHD originally fitted with a 901/05 130 BHP engine which was unfortunately stolen. I have available 2 aluminium cases and need some advice on which would be most suitable and least detrimental to its value. I believe both are physically the same, one is a engine number 9016## and the other is from a 911 T so has an 8 digit number (definitely aluminium though) engine number 2080####

I would love to find a 901/05 case but I don't want to miss the opportunity of having a correct 2.0 ali case if I don't find one. My stolen engine was 907246

Any advice would be greatly appreciated.