My doomed 408 build

PRH said

The part number for the heads is different, between the flat tappet or hyd roller springs.

I’m pretty sure the hyd roller spring is either a dual or a dual with damper.

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The part number is 60775 (For Hydraulic Roller Cam)60779 (Hydraulic Flat Tappet Cam)
Problem with a proper ID via part number that is machined on the head, is that the part number machined on the head is "6077" missing the last digit to see what the head was put together with...
I will double check tonight to see if it is a single spring or a double spring set up.