Whats needed to mate a LS1 to 700r4
http://advanceadapters.com/product/3741/712500A.html
I believe you can use the stock flexplate and the holes would need to be elongated for the 700 converter. That has been mentioned a few times but I don't know for certain, myself. If that is the case, then all you need is this spacer...
http://www.summitracing.com/parts/HUP-HP3795/
I have read that some have not used the spacer but I won't be brave (or foolish) enough to try it. Apparently it is added support for the converter. If someone has more knowledge on this please feel free to correct me.
Double check the part numbers but this should be the right stuff. I know you need the beveled plate and maybe a spacer. You could modify the bolt holes to make it fit.
Flex plate PN. 12551367
spacer PN. 12563532
longer bolts PN. 12563533



