first thing to do is get the compression test done right, till then its anybody's guess at the problem. remove all plugs and check each cyl. with about 4-5 compression strokes. a good engine and you will be at top compression in about 2 strokes. if that cyl. is low then pull valve cover as mentioned and look at rockers while cranking. a worn lobe will cause valve to not open or just barely move. nothing unusuall for the cam to be worn on a 350 espessially ones that idle lots. but it can be any thing from a bad plug, wire, cap , rotor,ext. you said yourself sometime it runs normal, and valve train will not do that. when its worn its worn.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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