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Re: Continuing Coolant Leak 72 350 engine
No telling of the intake has been cut, but I'd think it unlikely.
Milling heads won't affect mating surface angle unless they did something fancy like angle-milled them (again, unlikely). Intake will just sit higher relative to the heads.
Even new intakes can be warped, 47-year-olds can easily be not flat anymore. Best to check and confirm *everything* you can - like bolt thread depth as mentioned above.
Also, +2 on swapping out that bracket bolt for a stud - then you'll know you've not bottoming out and have max thread engagement.
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