Will have to start watching out for parts.
My 1HZ has the turbo adapted to the standard 1HZ exhaust manifold. I might be wrong but it looks a lot more restrictive than the 1HD-T.
1HZ and 1HD-T manifold are essentially the same, but the 1HD-T manifold has a different flange for mounting the turbo.
If you have an aftermarket turbo, there would be an adapter on the 1HZ manifold.
I used a 1HD-T manifold because it simplified the install of a factory turbo.
I bought a new genuine manifold (front part only) via amayama because I was having trouble finding one from a wrecker at a sensible price.
Amayama's price was decent IMO.