If your interested in doing it yourself, I have a couple of videos in my "low budget 318 build" that would be relevant to what you could do in the bowl area. Bowl clean-up would really help take advantage of the bigger valves.
I agree, but the casting looks factory textured.... hard to tell by the picture.That intake bowl is not stock.
Looks like somebody ran a 75deg bowlhog in there and left about 3/16" of the orig.
bottom cut, nuttin' wrong wit dat !