[69 C10 LWB]

The short answer is no. Now for the long version. Your best bet would be to get one for the truck you pulled the front end off of. You need to try and match the master to the brakes and a 6 lug c20 van may have different calipers from an 8 lug truck. You also need a manual master if you don’t want to use a booster. Manual brake trucks use smaller pistons to create more pressure and power brake trucks use bigger pistons so if you use a power master cylinder without a booster it will work but will require more force to stop.