Interesting stuff
What you planning to do to get the 302 to 700bhp?
And how long you think the standard 302 block can take 700bhp?
From what I understand even 500bhp is enough to split the standard block after a while.
And thats when using turbos, with nitrous and/or a charger the stresses are worse (due to sudden power increase with the gas, and extra crank stress with the charger) and often fail about the same power, but quicker.
Good job so many uprated blocks are available