D4B with leveling washers or late intake with leveling washers
You should be fine with the leveling washers. Here is a pic of my D4B sitting on later model 302 casting heads on my 273. Same bolt angle as your heads. I chose to use a Weiand 8007 I had laying around instead of fooling with the washers. I did use the D4B that I have on a 71 318 without doing a dang thing to it other than bolting it on, because at the time....I didn't know the differences in the bolt angles. It worked just fine and sealed perfect.
You should be fine with the leveling washers. Here is a pic of my D4B sitting on later model 302 casting heads on my 273. Same bolt angle as your heads. I chose to use a Weiand 8007 I had laying around instead of fooling with the washers. I did use the D4B that I have on a 71 318 without doing a dang thing to it other than bolting it on, because at the time....I didn't know the differences in the bolt angles. It worked just fine and sealed perfect.