timing without a timer?
i don't have i gun and need to adjust the timing on my 305, can anyone give me advice on how i can adjust my timing efficiently without a gun?
any help is appreciated, thanks.
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69' ![Chevy](http://67-72chevytrucks.com/vboard/images/smilies/chevy.gif) 1/2 ton
long and fat
all original strong 305 for now
4 speed granny
remote start ![headbang](http://67-72chevytrucks.com/vboard/images/smilies/metal.gif)
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