Headers in 67 C10 ?

[brans72]

Ok guys We have a 67 C10 with 350 engine and 700R4 transmission,also Front crossmember is from a 83 truck. All that is installed no biggie right well I am curious befor I start going to deep if the Headers I got with the engine (79 C10 truck) will work in my 67 C10? I tried for few mins with now luck thought about pulling transmission out since still building truck. So will headers from a 79 C10 work on 67 C10 if I got a 83 crossmember? Thanks in advnce guys!!!!