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If you do need to change the springs there is a tool available that allows you to leave the head on. With it you end up changing 4 springs on 2 different cylinders at the same time. It only takes about an hour to change all 16. Mancini sells the tool.
This is just one of the tools he sells for the small block. ~$63
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Rule of thumb: If you're running a 5/16 fuel line, you only need a single spring. If you're running a 3/8 fuel line you need a double spring. Oh, and don't forget to line up the dots on the springs and retainers otherwise your spring timing will be retarded. 
Don't confuse him he will actually try to figure how to do that! 
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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