Hope you haven't paid over the odds for it, it's just a bog standard K-series after all, the Metro boys make that mistake all the time! All but the very late S1's were dizzy, but either way it's a simple case of just swapping the inlet cam from engine to engine if needed. Your FL loom will plug and play so no worries there. Fit a new belt, tensioner and w/pump before you fit it, and a new inlet manifold gasket. Might as well do the cam seals whilst your in there, too/ You'll need to swap you FL flywheel/clutch assembly onto it as the Lotus one uses the Rover car flywheel which has a smaller clutch. You may also need to use the FL O/S lower side mount (the bit that bolts to the side of the block) as the Elise use the MGF one, which is slightly different.
