Makes no sense^
Why should he ship to you, then you get everything from someone else ( more shipping) then you assemble and ship back to him? All the engine builders on here would take his engine,completely tear it down,upgrade whatever he wants , and some would even dyno tune it,then ship him back a complete running motor. I don't see where you fit in , in that scenario. See, now,if something goes bad,who pick up the tab? You? The builder who sent the parts? See where your customer ( as you put call him) is getting less for their money?
And i find it VERY convenient that you are & have been doing port-work,and then you conveniently pop up to "help" a "customer" by being the middle man when he wants some engine work done. What a convenient & economical way to get your hands on something other than a race logic template.
If that's how you want to go bout it,that's fine, i really don't care, I'm just trying to help out future new guys to go about dealing with reputable shops ,,the right way. No middle-men. There's no need for it.