351W stroked to 408, overheating

[Abysmal]

Gentlemen:

While searching the internet for other people with my same problem I came across this www site for Cobra enthusiasts and thought I might partake of your knowlege..

I own a full size Ford Bronco that was born with a 302 in it.
Several years ago I pulled out the 302 and put in a 351-Windsor stroked to 408. The engine is as follows.

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351W EFI Bored & Stroked to 408
Accel Fuel Pump
Automotive Racing Products (154-3603) Cylinder Head Bolts
Clevite Engine Parts, Main Bearings, LE-MS1432P
Clevite H-series Connecting Rob Bearings, CLE-CB663H
Cloyes Timing Chain
Competition Cams Hydraulic Roller Pushrods
Eagle Specialty Products 3-D Rods
Eagle Specialty Products Forged 4340 Steel Crank
Edelbrock (3838) 61mm Twin Throttle Body
Edelbrock (3881) Performer Truck Aluminum Upper & Lower intake manifold
Edlebrock Plenum Chamber Gasket, EDL 3832
Edelbrock Performer 6037 Aluminum Cylinder Heads
Felpro Intake Gasket, 1250FEL
Felpro Oil Pan Gasket, 1810
Ford SVO M-6250-E303 Hydraulic Roller Tappet Camshaft
Ford SVO Hydraulic Roller Lifters
Ford SVO Aluminum M-6582-B351 Valve Covers
Ford SVO F3ZZ12-A-650-FB EEC-IV Mass Air Computer
Ford SVO M-12071-C302 Multiport EFI Wiring Harness
Ford SVO M-12071-D302 Sensor and Relay Package
Ford CVO M-12071-E302 Engine Harness & Controls
Ford SVO M-9593-B302 EFI Hi-Flo 30lb Injectors
Jacobs Ultra Team Ignition
Jacobs Opto-Timer Deluxe
JBA Shorty Headers
JE Forged Pistons, 9.6:1 compression
JE Plasma Ceramic Rings
Melling (83) Hi Volume Oil Pump
Michigan 77 Bearings
Michigan Cam Bearings
Mr. Gasket Intake Manifold Bolts
Napa Aux Oil Cooler
Napa Starter
Superchip Custom EEC chip
Vortech Mass Air sensor
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The first build on this engine suffered the following fate
3 pistons had rolled skirts and the other 5 pistons were scored from excessive heat. Cylinder heads were warped, the head gasget blew out, Rings and main bearings were toasted.

In short the first engine melted.

That engine was stripped down and completely rebuilt and a new 3 core aluminum radiator was installed which seemed to help quite a bit.
BUT...

Right now, on long uphill grades, the oil temp gauge pegs the needle past 250, and thats WITH an Aux. Oil Cooler running Mobil One synthetic Oil.

Normal midsummer driving around town the

Outside Air = 110 degrees
Water Temp = 210
Tranny Temp = 180
Oil Temp = 230

Under any real load the Oil temps shoots up, the water temp follows very quickly and there is detonation to be heard in the engine.

Where should I be looking for the source of all this heat ???
Bad Chip?
Bad Cooling System?
???