If your at 10:1 with a forged bottom end you could probably get what you want with a thicker head gasket, blower cam swap, and a blow thru carb. I am about convinced to do this on my next scratch build because it is so simple and effective. The blow thru uses the fuel for lowering iat's and most are not using an intercooler. This type of build is an art so you would need to find an experienced guy to help with the mods. 700hp maybe with race gas or E85, 600hp with 92. You would have a daily drive pulley and a smaller pulley for E85/race gas.
Super chevy modded a BBC 502 and got 1073hp with the whole build costing $13k from scratch. My guess is your 700hp could be done for less than $5k.
The general consensus is your block is the weakest link but will live long at 600hp. An occasional run of 700hp shouldnt hurt it. Consensus is the vortech units run cooler, which might be important with no intercooler.
Steve Morris Racing Engines - D1SC kit $3.5k, Blow Thru $1k-, cam swap, gasket change, head studs, $1k-. Add in a good tune and your at $5k.