I have seen the chev v8 swaps in almost everything.
I myself have installed ls1 into bmw e39 and jag xj12 too.
The agreed upon factor is that while abs will work passively. Bas and esp will not. The ac failsafe wont work either and neither would the complete factory gauges.
Meaning. Its a half baked car, the beauty of the ESP is that it keeps the car pointed straight even on wet road. Once not working with that cheap chevy v8, it was a sliding car.
Btw. Those cars were not registered in the state of tx due to these.
Btw
Mark 2, cresta, cressida etc.. are very simple cars for me, I call them egg n potato cars. Doing a job on a mark2 is very very easy. I can even install a 2ur in a mark2 and have all systems running in a short time.
Installing that same in a w210 and making sure whole car works... lol. Yeah it will start and run, have separate button ac, disabled vacuum locks, jugaar windows and power locks, indicators rigged because front sam not seeing a running terming point. (You cannot twin ecu it like rx8 as it requires engine running input). The door pump also is a rudimentary sa module on the bus.
The chevied bmw and benz you see online are mostly drags or recreational vehicles, not daily drivers.
Take it easy, you may be doing good jobs, but compare apples to apples, not apples to chanay.