I'm with willresper on this one. Before you go through the expense of swapping in a new engine with/without turbo, find out what the noise really is.
If it is piston slap, then compression test will verify it. If it is hydraulic lifters, then the O rings at the bottom of the engine sump need to be replaced to get the pressure back up.

You could swap in a turbo, I suggest light pressure, from a 97. You will need the ECM for that engine setup, plus a lot of vacuum lines to run the turbo.

If you do a swap, replace the rear main seal. Otherwise replace the RMS during your clutch swap.

I watched a couple of novices race around a small closed road course a a Street Survival class. A vette with a 457 engine driven by an early 20 something, and an 855 N/A with a manual shifter by a 16 year old. The 855 actually passed the vette on the back stretch after gaining on him lap after lap! The vette kept loosing it on the hard 90 degree turns and the 855 didn't slow down a lot. You have a good combination engine/tranny.

Klaus
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The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)