No problem at all, just expect a heavy pedal. Most racing cars dont use " vacuum assisted brakes" as you have more feel when braking.

I ran stanza brakes in my coupe for several years with no booster. worked just fine. The only tip I would suggest is to upgrade the brake master cylinder to a larger bore diameter. Most of the larger datsun range of a similar era would be a suitable donor. I used one from a 240K. 7/8 inch bore.