i've loved the reading so far, it's clear how frustrated you are getting as each post goes by and how passionate you are buddy.
many people don't know how the heat exchangers work and it's a good chance for them to see the insides in this pic. I was thinking that it might be possible to get the covers stamped out here in PK and possibly be able to make something useable out of what you have left there. i'm guessing as long as it has airflow and is correctly sealed then it might just be possible. but it'd be a major "khuwari".
i'm a bit confused, the code on the manifold states "AH" at the end which means it should be form a 1600 from 71-76. i thought the manifold for the 30 & 31 carbs was coded "AR" as that is the only 1300 DP i know of.
i'm just asking as i'm new to this compared to you and hoping you could shed some light as i'm also looking for a manifold (jus the centre) as i'm trying to switch my 31 to a 34 in the 1303 and need all the guidance i can get.
mix a 50 : 50 ratio of compound polish and car polish (or brasso liquid and car polish) and go at the surface with a soft cloth. it'll shine it up in no time.
i'd suggest you have a look at my 1303 thread to give you an idea as to what could go wrong. mine was by far the worst 1303 in PK when i bought it but it's abck on the road now, so it'll be a "worst case scenario" guidline to your rebuild.
good luck and i suggest you invest in allot of painkillers:)