1500 motor swapability

["Larry Vaughan" <lvaughan@pldi.net>]

Hi all,
I pulled my '73 Spifire motor and have it ready for the machine shop. The
head has a tapped and plugged hole right above the rear stud for the
intake/exhaust manifolds.
My'77 motor head doesn't have this plug and my spare, unknown year head
doesn't have it.
Are the 1500 heads and blocks interchangable?
Larry

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