So I'm going 1340cc. I Have two options in my shed to work with, b12 motor or my 1052 block with a gsx1100F Helical 1127 crank and clutch. I know the Teapot Coil Spring clutch is stronger then the b12 Diaphragm Clutch but are there any other advantages one offers over the other? Which has the better head? etc, etc. Decisions, decisions.