I'd take the broken piece down to the plumbing supply and get a ferrule or a piece of tube that just fit over it and sleeve the pieces together .... clean it good and use some JB Weld it it's not a real tight fit, there's no real pressure in that tube

I had a 57 that had the tube end above the rocker shaft with a slight crimp, just a bit higher than yours is broke - engine worked fine

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics