... I used the 350 Chevy (small block) as my muse, then (as acurately as the scale would allow in LDD) I recreated it and put a big blower on top (not forgetting the compressor pulley).
... using this basic platform I've made all my V8s and even a tripple carbed straight six (see Taxidermist)
... I used a MiniFig plane prop as the radiator fan. For hot rods it'll be easy to make this fit, but, for any car with an enclosed bonnet/hood, you may have to remove some pieces (from the engine or your MOC) to make it fit.