There not many headers out there for Y-blocks,but so happens SB chevys are close enough to mod into some fairly EZ.
Ford Y and the SBC have the very spacing for out side tubes and the center tubes only need to be spread about 5/8in. more apart to fit Ford flange. Here some photo of me doing it.
I was lucky and was given a pretty good set of SBC hearders that only had a crack in one tube next to flange,from my buddy Rosh=he replaced his with new ones for his nice T-bucket. I'm making these for my 1928 "A" with my Y-block,should look much nicer then older not so good that I had.

"The Bat" out of hell

50's & 60's hotrodder

retired speed shop owner,built and design hotrods, racecars

airbrush t-shirts, engine balancing

Miami fl.