Re: 8BA Valve length
If all you're worried about is that on one side the valve is a bit longer (as far as installed spring height), just shim the spring to the correct installed height you're looking for - or use offset valve keepers.
You were only talking about .040 . . . which is obviously less than one .060 spring shim. I can see no need for custom guides - though Gary's guides are good to use regardless of the perceived spring stack height issue (his regular ones).
First of all - just measure your current installed spring height - how many shims do you need to get to 2.00"? Also, you might just consider some lash caps for the "tall" side.
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