Cleveland and other v8-engines have heat riser ports allowing exhaust gas to warm up intake manifold for enviromental reasons and getting the motor to get into running temperature as soon as possible. This also causes the carburetor and fuel to get hot.
This also get the fuel to evaporise and the motor is hard to get started when hot.
To prevent the fuel to get hot one trick is to block off the exhaust ports.
(a scissors-cut piece of beer can is traditionally used to block them off)
This is my stock 351C-4V intake manifold.
In the first pic you can se the slot in the carburetor mounting surface.
In this slot hot exhaust warms the carburetor base.
The thing marked to the left is where the stock carburetor automatic choke connects to the intake with a tube. When the hot air rises in the tube the choke will disengage.
In the second pic you se the underside. The 2 small markings upper and lower is where the exhaust runs into the intake and the big marking is the chamber that will heat up and also is connected to the choke tube and the slot in the carburetor base.
The exhaust ports to block is the 2 small markings in this pic.
This heater chamber is also why there is a oil pan (turkey pan) between intake and cylinder heads.
The oil pan is to prevent oil hitting underside of the intake
The reason is that the exhaust is very hot and the oil from the lifter gallery will hit the underside of the intake and boil into char.
Eventually this char will end up and in the oil pan cause to block the oil pump screen.
When running a aluminum intake or blocking the original exhaust ports it wont be a problem.
You can run a turkey pan or not, its your choice.
When doing this it will take a little bit longer to get the motor into working temperature but the problem with evaporised fuel will be solved.
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