Wouldn't say thats very high at all. Most modern engines run a lot higher compression ratio, and also a higher bmep. It's the low compression of these engines that allow such tuning without much fuel modifications.
Grant's right, they ran an F28 6 speed gearbox from a calibra/cavalier turbo 4x4. The F20 might be better suited as it has shorter ratio's and is 5 speed, but still don't think it would work very well.
Yes it will spool it earlier, but top end performance will be restricted due to the engines increased displacement. If that wasn't the case we would have v8's running ct9's TD05 on a 5e will spool very well and at 1.5 bar will still be producing very good figures. Torque is the much more important factor rather then bhp.
Go external wastegate, much better and precise control over the boost. Don't think a TD05 will flow 350bhp, will get close to it though if your not that worried about chasing figures.
Long fucking wait dude, I have seen you can get them cheaper from Ksport directly cheaper than what TD sell them at I've found that TD are very expensive on parts, shop around and there are bargains to be had.
Depend what fuel pressure you want to run? Not all 440's are the same, they have different spray patterns. Your after high impedence injectors, there is a thread somewhere that tells you what injectors from other cars are a direct fit.