There is no dimensioned drawing for the cowling - the only place it is shown is on a couple of scaled side views - if the scaling is accurate, some (near) dimensions might be recovered there.
I put a tape measure over mine and came up with 36" wide across the cowl (mid engine). Length at 34 1/4" to the front face (Lyc 0320 dynafocal & 4" prop spacer). Firewall width at 25"