Engine upgrade options

Wonder if Jody has anything for me.?

This question may seem a little left field but I figure that there is more combined knowledge here than anywhere.

I'm replacing the long block in the SAN due to a winterization issue from the PO.

I'm considering two opions:

Boring option:
Replace the block & heads with direct replacement 330HP vortec marine long motor. Easiest option. Evehything goes back to stock.

Interesting option:
I can get a VERY good deal on a brand new LS2 6.0 litre motor, complete with loom & computer. And I can get it for nearly 1/2 the price of the direct marine replacement to my current excallibur.

Questions:
1. Is the LS2 the same base as the ZR6.?
2. The vortec exhaust manifolds are different, but will the ZR6's fit.?
3. Will it bolt up to the bellhousing.?
4. Will I be able to make the gauges work.?
5. Will I be able to make PP work.?
6. Driveline ratios will be different. Will this mater?


The main reason I am even considering this is the price difference for the extra motor I can get. If I could get the extra parts I need & it will bolt up & in, it might be worth considering.? If I need to change G'box / v Drive, then I won't consider it.