Very cool! Are you going to flip the frame for lowness as so many old dirt trackracers did?
Can you make your own intake and headers? I am not so skilled, but these engines look great with a couple of weber side-drafts and 4 pipes sticking straight out a foot and a half or so.
Lots of folks like to say that there are plenty of aftermarket speed parts available because of the popular racing class that used them. Not so in my experience.