if you can take the car for a quick drive and get the car at full temp see what happens to the temp. once my car is first started the oil pressure is abit high but drops after the car gets to full temp.
front mounts are not illegal if you havent cut through the chassis or damaged ther reo as damo_34 has said and mounted correctly.
apply at regency for an engine swap form thing and send it through to them and see what they say. if you have the correct rated breaks to the engine you could get away with it but if not youll need to get the car engineered. if they say this, ask them for which engineer to use, i know on their site somewhere they have a huge list of them to pick from