cam question

k thanx, when i try to powerbrake it the car dies.My question is ys it stalling? ive been thinking just pull motor over winter an rebuild her,as stated before the guy who owned it before me said engine was rebuilt.I found lil things here an there on the motor that thinks he just slaped it together(leaks oil from valve covers,an leaks at one of the headers)or rebuild top end with motor in car.