Stock big block radiator cooling 700hp

Figured I would ask the question one last time before dropping $800 on a Griffin Radiator. My last motor was a 511 aluminum headed 10.55 : 1 with 20 degrees initial timing and 34 degrees total, with zero issues with cooling with my stock rad. Motor was built by muscle motors who claimed it was 625hp. My new engine is pretty much the same set up, making an extra 75 hp. Car is street driven and I have been using the stock shroud and mechanical fan. Anyone have any luck with this stock style set up cooling this much HP? Thanks Andrew