Decent Slant 6 carb, intake, header setup

My mechanic friend suggested that I take the slant 6 out and replace it with a 318 with 360 heads. To do or not to do, is the question.
360 heads will lower your CR on your 318 depending on piston height, swap a magnum 318 stock camshaft is nice better heads and compression and roller camshaft you will need to change the center link, upgrade brakes convert to v8 gas pedal new trans also new drive shaft slip yoke exhaust system radiator etc