never knew that, thanks. I was also thinking pulling a set of heads off another junked 3.4 have them PP, new springs, valves, etc. so I can still use the car. Once done, I'll just swap them on.
I was looking at the engine bay of some 4.1 gens. Looks like a pretty tight space to work in
my theory is you can make any car fast, just depends on what you do to it.