Simple question, since the engine I just bought is a '66 and going into a '74 car: will the '74 engine's spool type mounts bolt right onto the '66 block?

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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me

Yes, the later engine mounts will bolt right onto the 66 block.
FYI, The 66 "small hub" crankshaft will not bolt-up to a 74 automatic transmission / torque converter.
DD

No worries there. I'll be mating an A833OD to it (and will definitely make sure I get the right flywheel)

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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me