I am installing my 858 4bt in a 64 IHC that I am restoring. I will be adding power brakes and a duel hyd. brake system as used on 1967 and later veh. I have all the parts to install a vacuum booster including a nearly new vac pump for my 4bt. But I am wondering if a hydroboost would be a better choice. I have P/S pump and also adding P/S so that would just be a mater of pluming the booster to it. My truck does not use vacuum for heater or windsheid wipers so no need for it unless I use the Vac. booster. If you guys do recommend hydroboost what year/truck do I look for to get it from?