That must have been a true home mechanic who put everywhere this bloody orange silicone, we will now remove all of this stuff!
I will also think of replacing the two valve springs with a single progressive one, perhaps it would be an idea to replace the cup with titanium
For the valve guide seals, do you know another car with fitting seals?
Does it make sense to install them also on the exhaust valves?
Since in the parts manual the seals are mentioned with 48 pieces, but I suppose the factory saved parts, because also the Jalpa of a friend had them only on the intake side...

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RaymondQV
Countach QV Ex-Mimran #GLA12997, Urraco P300 #20530 sold in August 2008, Jalpa #FLA12203 sold in May 2006
www.countach.ch
www.jalpa.ch
When Frank Sinatra got his Miura S in 1970, he said: “If you wanna be someone, buy Ferrari - If you are someone, you own a Lamborghini”.