and, being a lotus, you could drop in other more common lotus power plants, such as the 2ZZ-GE toyota that keeps popping up.

you could possibly argue an allowance to use the next gen version of the Isuzu 4XE1 motor which was sold in the JDM gemini coupe or piazza/USDM storm GSi/USDM impulse (canada got some too). these would be much more common than the loti. I say possibly because the swap rules with mixed marques/badges are a mess.