Been working on cars for 30 yeare and have never heard of total tolerance stackup? What the hell is that? By the way, about to re install intake plenum and try to start. Did it just like the service manual said (except for dial indicator). Hoping and praying lol. Not much different from the way I did it originally. Have no confidence its gonna start.
I must have missed this in previous posts. Do you have a no-start condition? was the no-start a result of removing and replacing the heads?