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Always degree in the cam. And it does not matter so much what wheel you use, as long as your reference/zero point does not change during the measurements. I print my own degree wheels onto A4 paper, cut it out and laminate it. You cna have it any size, But remember a larger wheel, will increase the accuracy of your measurements, It is hard to discern 1 degree on a 3 inch wheel. But on a 30 inch wheel you can degree to seconds of a degree with ease.

tune it first then if you're not happy go further

Yeah, without the Ford logo obviously. If I remember tomorrow at work I'll see if they're still avaliable. Weren't cheap though. Yeah it's basically a choke for cold starts, also bumps the idle up when A/C is on, and ensures the engine stays running under decellaration. Sent from my Pixel using Tapatalk

The rear mount turbo is an interesting concept for sure. It's got a few advantages, like keeping heat out of the engine bay and less components to jam under the bonnet, keeping it close to stock looking etc. There would be lost heat therefore velocity from the exhaust gasses from the long journey rearward so you could go a size down in your turbine housing to compensate. I guess you would solid mount the turbo flange to the chassis with a flex joint on the feed side. It could run a sump under the turbo oil return and an electric oil pump to the feed in a closed loop oil system. It would give the turbo a nice uncontaminated oil supply not sharing with the engine, but adds complexity. You would have some lag as the long charge pipe from rear to front would add a lot of volume to be filled before making boost. As for the not needing an intercooler, I don't know whether the sheer length of the charge pipe and the exposure to cool air under the car would be enough to cool adequately.