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Carb adjust, idling too low.

I think the valve pockets will need to be machined.

Oil additives may work on those cars where varnish is causing the lifter to hang up. My experience has seen more issues with a weakened internal spring, only fixed by replacement. Like you though, I have never seen oil additives fix anything. Thanks for bringing it up.

A flat tappet cam will always be a flat tappet cam and a roller cam will always be a roller cam. You cannot mix the two because the design of the lobes on the cam are very different and they will self destruct if you play mix and match. Your choices seem to be, #1- do nothing and ignore the...

It can go on for years like that. Not necessarily a concern, just old age.

Please check your vacuum advance diaphragm.

Explain in more detail what you mean by "secondary stumble". What does that mean? Under what conditions, what RPM, steady throttle or when you accelerate, engine warm or cold?

Why won't it start? Have you made any electrical tests? Does it crank over? We need more info. Will it start on the flat? You only need two things for a motor to run- fuel and spark.

Good luck on your search. One little thing that hasn't been brought up is the possibility of an overheating coil. There is no test for this, they will look fine, but when warmed up will spark erratically or completely fail until cooled off. Just replace with another and try it.

Why do you need colder plugs?

Thanks for the reference.

Don't see these oil filters anywhere except on Ebay. They are not cheap.

Trying to "restore" '68 cuda w/383. Which oil filter would be "correct"? Memory is not so good anymore so I thought I would tap into this great body of wisdom here. As I remember, and what seems to be available, are two choices= one is white with two blue stripes and black lettering and the...

Or can the carb be starving? Low float level, clogged fuel filter or gas tank filter?

I'm not very good on Holley's but it sounds reluctant to kick in high speed circuits. Power valve? Dirt in carb? Air bleeds?