Brake Proportioning Valve Adjusting

I have a brake proportioning valve for a 1991-1995 MR2 and I would like someone to tell me how you adjust the valve and which ports are for the master cylinder into the valve and which go to each rear brake from the valve.

I'm installing this 1992 MR2 valve on a 1993 Camry V6 to replace a Load Sensing Proportioning Valve on the car and I cannot find a used one. I found this valve in Canada 20 kms. from where I live and it only cost me $22.00 CDN, including mailing cost!

The Toyota dealer wants $545.00 CDN. for a new one..........far out of my budget!

I have been told by a mechanic to set it to 70% for front brakes and 30% for rear brakes and it should work for me.

Thanks..... and any input is welcomed.