Not sure which engine is in Tuscan,if Rover V8 they are cheaper for parts,but if its a TVR engine like the Cerbera(AJP V8)they are expensive
One bill that sticks in mind on my bruv in laws old one was the pair of cams,£824!!!!!!!!!!!!
His crank snapped on his too engine re-build to 4.5 at Austec was £6000