There are 2 freeze plugs in the back of the engine block were the flywheel is, They may be leaking.
But I would look at the back top corners of the intake manifold real close and run your fingers around the corners and see if you get antifreeze on them.
The intake Gaskets are none to leak on Chevy V8 and V6 engines, It is a common problem.
Need to check the back to corners on the intake, they our none for leaking. There is 2 freeze plugs in the back of engine between the bell houseing and block.
If coolant is leaking from the back of the engine it is most likely that the intake gaskets need replacement or a possible heater hose connection depending on the year.
If it is red fluid leaking, then you have a transmission leak. If it is oil then the rear main oil seal is leaking on the back of the engine. You need to look at the top back part of the engine to make sure the back of the intake is not leaking oil, check back corners of the valve covers for leaks too. Need to make sure the oil sending unit that is back beside the distributor is not leaking oil. Ruel these things out before you tackle the rear main oil seal.
it could be a head gasket leaking, and running down the back of the motor. A compression test is the only way to be able to tell.
There is a freeze plug on the back of most engines that or a hose is leaking. Start with the hoses that go thru the firewall to the heater core inside the car. Good Luck and Remember.Change Your Mind, Not Your Oil.Use the First In Synthetic Motor Oil's.See My Bio For more information.
Starter i located on the back of the engine - between manifold and driveshaft.
Most likely cause is the intake manifold gasket-antifreeze will usually leak down the back of the engine and drip off of the starter or somewhere in that area.
Get under the vehicle and look to see if you can see the leaking freeze plug. If you can't then it may be between the motor and transmission. If so, you will have to remove the transmission to replace it.
could be freeze plug, or intake leaking
easy, head gasket
Worse case could be from a rusted out welsh plug on the rear of the motor. Also could be a heater hose or a intake manifold gasket leaking on the end. if so the valley will need removing.
There is a heater hose that goes to the left rear top side of the intake manifold and that fitting leaks engine coolant sometimes and it will run down the back of the intake around the distributor. If that fitting is not leaking then the intake manifold gasket is leaking coolant in the corners of it. REplace the intake gasket. That's all that can leak coolant on that year engine. If coolant is leaking out between the transmission and engine block then you have a freeze plug leaking in the back of the engine, between the transmission and block. Must remove the transmission and flywheel to fix it.