If it is Grayling limbs you can brace those upp to 8 1/2 or so. The old catalogs say lenght of bow strung 57 inches and that is about 8 1/2 brace.
I shoot mine at 8 1/4, that is Grayling limbs #1 with the B riser. And my new #3 bubinga limbs with A riser at 7 1/2 with dacron string.