350 block

i have a small chance to get a block for 100 ther are no cracks or nothing wrong with it an its so called a vortec motor should i cop an get a rebuild an if so what are something i can do to it to get 350-375 horses out of it.. if it is legit i will work on that til its ready an swap it for the 305

why swap a 350 for a 305 ??

i will swap my 305 for the 350 if i cop it but if its not a vortec i will jus throw a nice came an intake an carb in my 305 an ride til that bitch lock up