I found this on the internet and thoght it was good information on starting barn finds:
FLATHEAD START-UP PROCEDURES FOR OLD MOTORS THAT HAVE BEEN SITTING FOR A LONG TIME
Read completely before attempting to work on the vehicle
Use good safety procedures to protect people and property
This article may miss a couple things, but the following are the some of the usual recommendations:
1) Check oil for clean appearance. If very low, add to full. If overfull, drain out the excess. If it’s very thin or otherwise nasty looking/smelling, drain and refill with new 10/30W. If oil looks dark but ok, leave it for now.
2) Loosen the generator/fan assembly to allow lots of slack in the belt (or belts if a two-belt system). Try to turn the water pump pulleys by hand. Repeat this test on the generator pulley and the fan assy. If all parts turn easily, reset the tension in the belts by snugging them back up. If any of these rotating parts will not turn easily, leave the belt(s) loose. You will not need them to operate for a brief motor start-up test and they would just restrict the motor from turning over, possibly burning up a belt if it starts.
3) Pull the spark plug wire from the middle of the distributor to the coil.
4) Check and clean up any battery terminal connections. This includes the ground strap from the firewall or frame to the block. Use a new or good, fully charged-up battery.
5) Make sure all primary ignition wires are in place and that there are no bare un-insulated wires. If you suspect the wiring is not correctly hooked up, stop here and refer to the wiring schematics at
www.flatheadv8.com.
6) Remove all spark plugs. Have a look at each. Clean and re-gap, or replace as necessary. Most Ford & Mercury flathead V8’s originally specified the Champion H-10 plug, but here are alternatives if so desired. The gap should be between .025 and .030”. Complete tune-up information can be found on the FlatheadV8.com website as well.
7) Disconnect the fuel line from the fuel tank at the fuel pump for now. This steel line ends at the firewall and makes the final connection to the fuel pump through a short length of flexible fuel line. Disconnect either end of the flex line. This will prevent the fuel pump from pulling the old gas up into the motor.
8) Make sure all rags, hands, tools, etc are clear of the motor fan, and use the ignition starter switch to turn over the engine. If the starter hits but won't turn the motor over, don’tkeep trying. Place a socket and large breaker bar on the front pulley nut and try to turn the motor over manually, turning clockwise. If still stuck, you will have to try using some Marvel Mystery Oil in the cylinders to help loosen things up. If the starter turns things over ok, let it spin about 3 or 4 times, for about five seconds each time. This will help circulate some oil back through the oil galleys and bearings in the motor.