motor mounts ?

i am in the middle of putting a small block 350 in my nbs sierra but the motor mounts are different any one have any ideas or suggestions on what i should do

http://www.speedwaymotors.com/p/1906,405_Chevy-Weld-In-Motor-Mounts.html?itemNo=Chevy%20motor%20mounts

Or the stainless version.

http://www.speedwaymotors.com/p/6140,405_Polished-Stainless-Steel-Motor-Mounts.html?itemNo=Chevy%20motor%20mounts

http://www.welderseries.com/catalog/advanced_search_result.php?keywords=motor%20mount%20chev