What did these come on?

[kzcountry]

I dug out these out today, but wondering if someone could tell me by the numbers what these are.

 

[drive48]

pm sent
sold if selling them

 

[1wild&crazyguy]

340 manifolds,'68-'70, i believe, i have 2 sets but i've never been a #'s guy so they sit on the shelf while headers r on the car.

 

[drive48]

2863553 Lh 1968-71 A 340
2863549 Rh 1968-70 A E 340