Rich's63

Hi everyone my name is Rich and I'm new to this forum. I just picked up my first Oldsmobile its a 63 dynamic holiday 88 4 door I'm finding it really hard to find parts for this one ... what i need is a rear bumper and all emblems and horn assembly for the steering wheel other than that the car is in great shape but what I'm wanting is a 4bbl intake manifold want a little more hp out of her can anyone give me any pointers on how to obtain one or how to go about getting more HP out of what i have ....