Believe it or not Curtiss’ engine mount blueprint drawing for the early V-1710C15 “longnose” engine used in the H81/P40cu/B/C/Tomahawk have been posted on this site for a very long time but the drawing are lablen for H87 part number for the later H87/P40
I have a very clear copy of this engine mount blueprint drawing and while marked H87-001 they also say is for the P40B,C and V-1710-C15 engine and the mount points match the H81/P40cu/B/C/Tomahawk not the later H87/P40
Here is a close up of the lower right corner on the drawing below showing the mount is for the P40B,C ...V-1710-C15
Im also looking for engine cowl drawings for the H81/P40cu/B/C/Tomahawk if you find please let me know