engine conversion again

Moin Moin, so please don’t eat me right away: “Use the search” “Don’t pay”! I’ve already read quite a lot! So I have an AUDI 80 type81, built in 83, with 75hp, as far as I know the DT engine. I would like to install a 5 cylinder. I already found one. The dispenser car would be an Audi100. According to seller MKB KU, 136hp. Now I’ve already read you have to weld on the frame other motor holders for 5cylinders? In other contributions there was again that it n n what could I still use from the Audi100? The suspension legs? Brakes from or behind? Front construction and cooler? Could possibly also fit the complete switchbars? My Audi80 unfortunately has automatic. But think about that too long or so! Would I be happy to answer any useful questions! thank you already if you could help me further! would have to know that quite quickly, since the engine is otherwise gone! mfg razor