Best exhaust valve guide

Fellas, I need to do at least 5 exhaust guides and exhaust valves. The flathead parts are drYing up obviously but I can still get wildly varying prices and lengths on the guide parts. Question is, what is the best material for guides. OMB has parts for $6 for two guides and some of the others have real B&S guides for $18 for one. Wondering what the best way to go is.
Also are stainless valves better than stock parts, dumb question but I'd like to know what the experts think.

Happy new year to all the flat heads out there!
 
Length my opinion longer is better for longevity.
Short may impart a small hp increase.
There maybe installation issues though with the longer having more chance of sticking or busting the spring chamber out if stuck and hit too hard . From my limited experience.
 
Length my opinion longer is better for longevity.
Short may impart a small hp increase.
There maybe installation issues though with the longer having more chance of sticking or busting the spring chamber out if stuck and hit too hard . From my limited experience.
I'll make them as long as possible, just want to keep this valve running as straight as possible, as long as possible.
 
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