Hi George,
I had the same anxiety you and Doug have in the "research" phase.
When doing interference press fits you are pretty much committed once
you start ;)
-stop early or keep going...
Removal of AL-AL press fits will cause some spalling? damage and require
a larger insert.
Measure lots, machine under-oversize and finish with 400 grit sandpaper
if you like.
Give yourself some margin based on temperature for the interference fit.
Not hard to do - just time consuming.  The epoxy will fill any
imperfections anyway.
Again, practice on a junk housing or whatever to verify your plan will
work and gain confidence.

Decide what you want and Just do it!
Cary

Cary,
I have a lathe but am not a fitter and turner - so If you don't mind I will
ask some questions.
What difference in sizes did you allow for the interference fit?
What are the expansion (of the housing) and contraction (of the tube) did
you allow for.
I guess what your saying is that you allowed JUST SUFFICIENT  to slip fit
the two together, greased with epoxy and when they temp normalized is was a
good clamped-up fit.

Question, how did you manage to get the tapers in the opposite internal
sides of the water jackets. Tapers on the tube are easier enough.

BTW congratulations - job WELL DONE!!
If you have done it as I assume, this is the optimum sealing method - there
will be some Engineers on here that would be proud of your effort.
George ( down under)


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