ok i know i've talked to u about the car before..and from what i remember is that your just using a reg block...not sure if it was a 2 bolt or 4 bolt

but if it is a 4 bolt main block are the mains like scalloped right in the webing area if so.i wouldn't shoot that much juice.also i cant remember if what heads u where using and the hp out put of the engine in n/a fourm..if your going to make over 750hp or just even 700..i would fill the block to the freeze plugs to give it a lil bit more strength.and it better be a 010 block and thats not the last part of the casting number i'm talking about this would be on front of the the block under the timing cover in the upper right hand side..these blocks where almost the strongest stock blocks from gm..the stronogest are the 010 and 020 blocks with the non scalloped mains.just alil info for u.i would hate to see u get it together and have a block give on u