Not to sound harsh but you are spending a lot of money on parts that are going to disappoint you.
Do not buy cheap heads- don't really.
You do not need aftermarket fuel rails
A $75 jy explorer intake will flow almost as well as aftermarket ones. Spend $200 and have Tom Moss port the lower and it will flow better than most aftermarket intakes
For $390 for a cam- call Ed Curtis and get a custom cam that is ground to your specs and build.
My opinion for what it is worth
Get a $300 explorer junk yard motor- swap out the cam , valve springs. Put a TFS1 or N41 cam in along with new gaskets, oil pump, water pump, plugs wires, your distrinbutor, brackets, and exhaust and have a 275hp motor for under a grand
Or.. just buy the TFS top end kit and get 350hp for about $2600