Been selling my 53 Reg Astra Gsi Turbo for a while now with no luck

been offered plenty swaps p/x's (any1 interested pm me)

anyway, been offered a sierra cosworth plus cash

I do like sierras, but im in love with Escort Cosworths have been since i was a wee boy, but only 22 and still too young :s

this is the engine spec on the Sierra, havin been out of the ford scene for a while i'd like people view's on this spec, he's valued the car at £5500 worth it?

the guy claims 400bhp but im not sure,

any help/opinions much appreciated

its a white 2wd, 89 cosworth, lowered, 18" bk alloys, and quad lamps

200 4x4 block overboared 1mm,low compression pistons with large valve cut outs(91.775mm)
mlp heavily ported escort cosworth cylinder head with new guides
bd10 inlet and exhaust camshaft
4x4 inlet manifold with spacer plate fitted
3 inch bmw throttle body
t4 american spec xs power rx7 turbocharger with external wastegate (this spec of turbo capable of 650bhp)
both inlet and exhaust manifolds are port matched to cylinder head
tri metatic head gasket
403 grey injectors
stage 5 chip running at 1.5 bar boost
wrc spark plugs
scorpion exhaust system
L6 ecu
converted 4x4 engine loom
home made large breather system
4x4 flywheel with alcon 6 paddle clutch
pace rs500 intercooler
4x4 radiator