The firing order of the 305 Chevrolet V8 is the same as all other Small Block Chevrolet V8's. The firing order is: 1-8-4-3-6-5-7-2. I will post an additional link that you might find helpful. It will provide you with torque specs and other valuable information on the Small Block Chevy.
18436572
18436572
18436572
1-8-4-3-6-5-7-2.
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The firing order for a 305 Chevrolet engine is: 1-8-4-3-6-5-7-2
The firing order for a Chevrolet 305 is: 1-8-4-3-6-5-7-2
18436572
18436572 you already knew
1,3,5,7,2,4,6,8,
If you have a 305 or 350, it is 1,8,4,3,6,5,7,2.
the fireing order for a Chevy 305 is 18436572 with #1 being the drivers side plug closest to the radiator.