I have a vauxhall chevette,but i have a datsun a14 engine on but the problem is that my spark plugs are getting black of carbon every time an the engine start making like "Volkswagen Beetle" when idel an in low acceleration. Please help me!

Is it a dry flaky black, or a wet gooey black?

Its often wet with dark fuel, but not oily

This sounds like a fuel-fouled plug.

The most common cause is if the choke is stuck partially closed.

1. Ensure that right after starting the choke opens partially (at least 1/8 inch)

2. Verify that when the engine is fully warm, the choke is perfectly open -- straight up and down.

The choke is not connected in the car so it is always open, I have stock carb that is hitachi DCH-306. Am using denso w16ep-u on this engine.

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tune your carb for idle mixture and speed to start with.

The first step -- before setting mixture -- is 1) verify ignition timing (5-10 BTDC) and 2) Check the fuel level through the site glass. 1/8" above center is too high.

I have already adjust the fuel level and would like to know how to fine tune for the ignition timing on the a14 engine. Here am posting a photo of the fuel level.

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Wiki pretty much reiterates the workshop manual
http://datsun1200.com/modules/mediawi ... php?title=Ignition_Timing

Is your Anti-dieseling valve connected and working properly?