Help me ID this roller motor for my 68

Have a chance to buy a HO motor. Person selling says it was out of a Lincoln but he doesn't know what year. I've seen a picture of it and it does say 5.0 HO on the FI intake. Would this be a Mark VII motor? That would make it the same as a Mustang HO, right? If he's wrong about what it's out of, does it matter since it says HO on it?

I've done searches for a roller motor in the archives and I know the good motors are the Mustang 87-93 and the explorer 96-01. I also know that the Mark VII were rollers. BUT I know there are flat tappet roller blocks and this I don't want.
Thanks,
Andrew

Are the casting marks visible without removing the starter? Can you give me a general idea on the casting numbers? Which number or letter signifies year and make of the car in went into?
Thanks....

I think this should work, right?


FORD PART NUMBERS TELL A STORY
Here's how to decipher Ford part numbers, such as D1ZZ-6675-C, for example:
The first two digits indicate year. The letter is the decade;
A = '40s
B = '50s
C = '60s
D = '70s
E = '80s
F = '90s
G = '00s

The third digit designates body line;
A = Ford full size
D = Falcon
E = Escort
F = Pinto, Maverick, Falcon
G = Early Comets, Montego, Cyclone
H = Medium/Heavy Duty Truck
K = Edsel
L = Lincoln Mark VII
M = Mercury
O = Fairlane
R = Capri
S = Thunderbird
T = Pick-up Truck or Bronco
U = Econoline Van
V = Lincoln
W = Cougar
Z = Mustang
{there are actually many more}

The fourth position signifies Engineering group;
A = Chassis
B = Body
E = Engine

If it's a Service Replacement part;
Z = Ford Division
Y = Lincoln-Mercury
X = Original Muscle Parts program
M = Ford Motorsport, SVO, FFRP

The center number, four or more numbers or letters, is the part number.
The A at the end of the number indicates that the part is the first version. If it was revised once, it would be B. If it was revised again, it would be C, and so on. When they run out of letters, it becomes AA, AB, and so on.

So if we decode this number, D1ZZ-6675-C, we come up with the
following:

D1 = 1971 model year.
Z = Mustang.
Z = Ford Division Service Replacement part.
6675 = the group number for oil pans.
C = The third version of this part.



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