Tiss the season

Best thing to do is save the port window for last. Dont go deep when gasket matching except for the siamese wall, leave the pinch alone till you see decent shape at the ssr and bowl. Now try and get those windows in shape , though some are cast off to one side and or pocked ..like this..Have fun.lol
Tip, grind at an angle tip up to the marked line...then lean down. You get straighter lines. If you're really into it you can file finish the lines edge.