Art,
Do you have the EDZ casting engine block?
If you do, that is the standard production block used on the Minivans and regular cars.
The SRT and Turbo cars have the EDV and EDT casting numbers.
Although they say all the blocks are the same, I believe the SRT and turbo blocks to be stronger.
Another option is to use the DCR billet bedplate reinforcement.
http://dcrsrt.com/index.php?_a=product&product_id=162