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Crane roller cam (P/N 358851; grind #R-284/420-251-12). Duration is 420 intake, 420 exhaust, .718/.718 lift with 1.71 rockers.
Cam is in great shape, asking $175.
 

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My guess is the 420 is lift at the lobe.
 

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From the part number in crane catalog:

BROWSE PRODUCTS

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Main > Camshafts
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Main > Vehicle_Type - Auto > Cylinders - 8 > Engine_Make - FORD-MERCURY > Year - 1971 > Engine_Size - 370-460 C.I.
Camshaft Specification Card BACK TO LIST
Part Number: 358851 Grind Number: R-284/420-2S1-12
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1968 Up FORD-MERCURY 8 COMPETITION ONLY, GOOD UPPER RPM HP, 510+ CU. IN., BRACKET RACING, NITROUS, AUTO TRANS W/RACE CONVERTER, 13.0 MIN.COMP. RATIO ADV. BASIC RPM 5000-8200
Engine Size Configuration
370-460 C.I. V

Valve Setting: Intake .020 Exhaust .020 HOT

Lift: Intake @Cam 420 @Valve 718 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 420 @Valve 718
Rocker Arm Ratio 1.71

Cam Timing: TAPPET @.0205
Lift: Opens Closes ADV Duration
Intake 49.0 BTDC 87.0 ABDC 316.0 °
Exhaust 96.0 BBDC 46.0 ATDC 322.0 °

Spring Requirements: Triple Dual Outer Inner
Part Number 99885
Loads Closed 215 LBS @ 1.950 or 1 61/64
Open 622 LBS @ 1.280
Recommended RPM range with matching components
Minimum RPM 4800
Maximum RPM 8400
Valve Float 9000

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 34.0 BTDC 70.0 ABDC 107 284.0 °
Exhaust 81.0 BBDC 29.0 ATDC 117 290.0 °
 
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