4.3 vortec
#4
The 4.3 makes about the same horsepower and only slightly more torque than the 3.8 series II. Even though it's a big job to swap from the 3.4 to the 3.8, I'm willing to bet the 3.8 swap will be easier than a 4.3 swap.
#5
pretty much anything is possible if you have the time and $$, but to agree with above the 3.8 is probbaly going to be much easier or maybee the LT1
also here is a thread with some previous swap discussion
http://www.cz28.com/forums/showthread.php?t=150164
also here is a thread with some previous swap discussion
http://www.cz28.com/forums/showthread.php?t=150164
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