I have a lot of pics of my heads i did at home guys, no one told me how either. they are 360 heads but the principals are the same. they might help, not gospel people but will give you an idea. The comments are about what i did and these heads were on a 360 stroker and had 500 horsepower. some of a set of 318's i did for dad that made 370 horsepower.
http://s893.photobucket.com/albums/ac134/dvs265ap6/porting heads/