it's a bit of a shame to see joining as only being worthwhile to answer the 1 question, I'm sure you know there's a lot more to be had than that
but away, by way of enticement (
) the GTT engine will fit I'm sure, you'd want to keep your exising gearbox and driveshafts I expect (since I don't know if your speedo is mechanical or electical). I dare say even with the GTT gearbox your driveshafts will work fine, the GTT ones will be too short. I don't know what you will do about the front engine block mount, you might have to modify your own mount. If it's an F block you have now then it won't be far off, a re-drill might get it.
as for F7R manifolds, clio 16v or the tube manifold from a williams should go I guess.