Its possible to take a log car manifolds apart on the car but much harder to put the t2 style manifolds ON while in the car. : /
But i remember the first time i did a turbo starter motor i had heard it would be super hard and i got it done. I wont rule anything out completely..
But personally i have gotten to the point where i pull motors out and heads off rather than work in tight spaces being frustrated for the same amount of time. But i have space and tools and experience at this point. It's gonna be annoying the first time no matter what way you go.