Xapples

Thank you for taking your time to help me! Title says its all, I know how to turn a wrench but as far as putting a junk yard motor into a a car that runs. Lets just say I would feel better having a guide to follow. Anything you guys or gales can give me that maybe you have run up on in your past of know of would be a huge help! I don't much mind if its a 350 small block or a ford 302. I just want a motor that hits something that I can take above or around 350 Whp or 400HP with around 400LB or torque. The overall goal of this car is be turned into a sleeper. I plan on doing (( all)) or most of the work to the car if I can help it. Questions : 1 Best websites to shop for body parts for a 280zx? (( rear taillight is busted --- Bought the car like that. Would like to replace it.)) 2 I am trying to shoot for horse power and torque ----- keeping a solid line of power on both ends so the car grabs hard and pushes harder. 3 Guides for conversion's kits? Best motors to run when looking for a sleeper speeder? Solid transmissions to run with those motors? Thanks again for the read guys and thanks for anything you have for me!