Current plans are 2.8L ,P90 with tripple 45mm webers, 74 Deg cam.10.5:1 etc
As for the head casting I have had good experiance with the P90 Big valves large ports and compresion can easily be alltered by changing piston shape.but this is not set in stone as it is early days, Just chasing up some parts
Havn't used the N42 before how do they compare?