what to keep and what to sell. questions questions.

From what I am reading, (little experiance wih sb motors) if it is a budget build, Magnum block (for ANY build, due to better iron in block, rollercam) EQ heads reworked, pick the rest for the manners you want. I understand the Magnum blocks can handle more hp than LA blocks?
I know this may come as a shock to most but it's my first rebuild so I'm not sure about the HP. Kinda learning as I go gotta start some where am I right?