Your selection criteria are "any random, car engine available to me". There's a problem with that. You're looking at peak car engine power and mistaking it for continuous engine power.
Drag racers have built 300 kg Chevy V8 engines that output 1500 kW... for 9 seconds. Contrast with
- a 1500 kW marine engine made for lowest total cost of ownership that weighs twenty tonnes.
- a 1500 kW aircraft engine built for minimum possible weight damn the cost and maintenance schedule, that weighs well over a tonne.
The fact is, most cars cruise at maybe 25% of their maximum power on old-tech engines like the VW... less than 10% today now that a V-6 sedan has a "250 kW" engine in it. (Sedans take less energy to cruise than they ever did, because of weight and aero drag improvements, yet the engines get bigger and bigger max power ratings for competitive reasons, and because EFI (FADEC) has just gotten that good).
The result is that car engines are not designed to be able to cool at continuous 60 - 100% power, as is expected out of an aircraft engine. If you attempt to run a car engine that hard, you will get untold thermal problems from oil coking to cylinder warping, because the engines were just not conceived to run that hot continuously, and so were never designed nor tested for that.
As such, you would have to dramatically de-rate the automotive engine to keep it at a power level it could sustain continuously. At that point, you would have a very heavy engine for the power you are getting.