I would've thought if it was chain wear it would've been noticed when you had the engine in the commy. From what your saying it's started doing this since the engine swap and dizzy swap is that right? Thats why im thinking dizzy/timing etc. Also single points is probably a bit risky at 7000rpm, have you had it up that far with that dizzy? Its very high revs for a 253! Also i thought a 600 carby was pretty big aswell but if it all worked previously it must be good.
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