This mod allows you to put almost any engine in the game into any car in the game, but it actually works.
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Changelogs
Version 1.3
Added 5 of the 7 engines that don't go into any car in the base game - I4 DOHC AQC RWD, I5 DOHC ADI, V12 DOHC MRC, V6 DOHC VR38DETT RWD, V8 Ford Small Block 302. The other two that are still missing: V6 DOHC AKY and V8 Ford Small Block 289 F.
You can swap almost any engine into any car. With some engines you won't be able to install a gearbox, which means the car won't accelerate. So far I've seen this happen with two engines. 1 - V12 am11 and V8 m159. There might be more.
Most of the time the engine will be misplaced by a bit, or rotated differently, exhaust pipes are not going to align as they are tied to the body of the car, but the engine will be fully functional in the car.