My dad wants to put in a 351W in hit 87. My question is all the extras (air intake, TB, ERG, Headers) Do those all have to be 351W Spec'd?

 

If you do not put parts in the car to support the extra cubes it will not work very well. Do a search for cars with 351W engines in them that work well. Look at what they are using and pay attention to the combo. That will give you a better informed idea of what you will need to do it right.

Joe