With the main girdle, hard block filler, arp everything, a forged and balanced lower end the block should hold up fine. As long as you don't run too high compression and start having detonation. Your machinist should be able to give you the best estimation on how much hp it could contain by looking at the block and checking it out.
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65 fastback 347 DFI injected w/vic jr, TFS heads, MSD, cable T5 w/Hurst, 4.11 9", tc subframe conns, custom traction bars, griffen alum. radiator torq thrust D's, and a daily warrior
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