headers in 63 c10 short with 454cu

[FamilyMike]

Has anyone or does anyone know what work if any will need to be done for a 454 with headers to fit in a 63 c10 short fleet? I may be buying one with the motor and 400 trans in it but not finished, no exhaust manifolds or headers installed??? Is this the reason why it is not finished, I ask? Hmmmmm.... If anyone can help answer if this set up will be able to work or if I will have to get custom headers or something for it? Do I have to mess with the frame etc.? This may sway my purchase decision. Thanks in advance fellas and ladies.