I have one for between the two halves and I think it will definatly help reduce manifold temp in the top half. am a little unsure about the one to between the head and manifold will go with fuel distribution moved out that extra 12mm or so.
the reason your tips will be crooked is because the exhaughst is probably on crooked somewhere, most likely up at the dump pipe, especially if its a standard one.
once your rocker gear and cams are off keep the timing chain up with 2 hammer handles or something and you will be able to turn your engine where ever without drama