I have a 1984 ford e van, 351, 4 barrel, i can leave it in the laneway running and wont stall, when i take it on the road, the van loses power, then stalls, and the battery is dead, i unhooked the battery cables and van stays going, so alternator is good, tried different batteries, dont know what the problem is

351 "C" 4V 1970-1973 Cleveland
http://www.carmemories.com/ford-engine-specifications/351-engine-specs/351c.html
would have thought engine capacity would be what they wanted
351 cubic inches which converts to 5.75186 litre capacity
horse power in the link above is 300 BHP (brake horse power)

I have no idea myself but found the car memories web site that states the engine specifications and I hope it is correct and matches your engine ?
most likely it would be rounded up to a 5.8 litre capacity

Hey Thomas, did you go over the distributor and the pick up in cap, it all sounds like ignition check to make sure when it stalls that you have power to coil ,you can do this before you start an leave it on and see at the moment it stalls if you loose power to coil, also check the starter relay on fire wall .
Woody

insufficient battery power to stay running. replace battery or alternator.

You may want to have the TCC (TORQUE CONVERTER CLUTCH INVESTIGATED). THIS IS ALSO KNOWN AS A LOCK-UP TORQUE CONVERTER. Controlled by the computer. Hope This Helps.

Any engine light? Can you hear the fuel pump run for a couple seconds when you turn the key to ON?

you can go to autozone web site and register your VIN # and click repair tab and find all the drawings there..its free

They also used 5.8L/ 351 windsors as well, and 4 barrel carb on some.

Unfortunately, old ford trucks **** gas. However, you can check your emissions controls. A stuck valve or switch can drastically change your efficiency. Make sure you have a clean air filter, check your timing, and carburetor settings.

Did you check your fuel pump to see if it is functioning right or not .

The most commonly used V-8 used in the 1984 Crown Victoria is the 5.0 liter /302 cubic inch engine.