It would great if the dates all fell within a few weeks of each other, but if not, doesn't necessarily mean they are not original to the car IMO. But the heads normally are very close to each other in date. I believe there are times though when these engines went together at the factory & one head came from an old casting lot, & the other from a fresh lot of castings. But still close in date, they sure wouldn't be months apart. At least thats what I found with my cars.
If I was taking a wild guess, I would predict your
Intake & heads to be something between E018 & F098 The block will probably have a mid/late 1977 casting. The same 4X heads were used on earlier 350's so if it was replaced it could be a mid 70's date even though the W72's didn't exist yet.
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68 GTO 4-spd Convertible
78 S/E Trans am L78, WS6 Auto
78 S/E Trans am W72, WS6 Auto
79 10th aniv W72 Trans am
80 Indy pace car Trans am
89 Trans am GTA
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