Again if you wait till Black Friday which is about four months away you can buy them for $700 just like the person who's trying to sell them to you for a thousand. If you don't wait you can at least buy the ones for $1,172 and get a $226 intake manifold... @318willrun has a video on this forum and you could ask him to link you to it going through the Speedmaster heads. How to check them and how to lubricate them at home... You'll need no more than a harbor freight tool to take the springs off which shouldn't cost you more than $13... I had mine professionally checked for $95...
