Iv got some occasional knocking in one of my valves from starting the engine (1965-413) with the petal all the way to the floor (BAAAAROOOOOMM tick tick tick tick...."woops-darn it!"). I had a hard to startup at one time, from one of those fuel additives a while back that has since gone away.
Blowing a small amount of gray smoke when I accelerate hard too. Again the noise is only occasional and when I accelerate hard. possibly a lifter. Is this hard to remedy? Costly at the garage?
Am I correct in the diagnosis?
If this was a Navy FA-18 Hornet I'd know what to do!