after sorting thru all these opinions it seems most say go for the cubes. I guess if I had an after maket block it would be a no brainer,but i'm using a stock 400 block and have been told the longer the stroke the harder it is on the block.looking for durability here too. the 470 still looks good to me. so i'm still undecided on the 470 and 500. i'll have to just weight things out abit. thanks for all your help.