I have just bought this car. Cheap I know, I thought I was getting a bargain!!!

http://pistonheads.com/sales/1269181.htm

The car is in very good condition cosmetically but mechanically has been giving me grief already.

On the way home it wouldn't rev past 4K and would only boost to 0.2 bar, then a mile away from my house the top end started rattling like a tractor. The oil pressure light is nackered so I don't know if there's pressure and there is no dipstick due to him not fabricating one for the ZVH conversion. There are receipts for everything including zvh rebuild and T3 turbo and it hasn't done many miles since. I am totally new to Fords but not new to problems as I've had 3 R5 Turbos lol

Any advice on what steps I should take to see what the problems would be much appreciated