Heads, maybe. You will spend $$ on gaskets and such. Carb and intake...depends.
You have a set of heads that flow "X" and a carb that flows "X" and a manifold that flows"X" as long as the carb and intake are a 4 bbl, maybe.
Need to know what head codes, intake and carb. As well, you have a 400 cam (unknown) and all these parts need to compliment as to not cause engine to run poorly.
The brackets and pulleys will swap over.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.