$300 is a smoking deal on that turbo. I know mine will be limited by back pressure with the smaller a/r and 3” downpipe, but I couldn’t fit a 4” downpipe between the trans and t-bar if I wanted to...at least not easily.
I don’t know how much different the early a bodies are, but I was able to(barely) pie cut a 4” downpipe that snakes between the trans and torsion bar on my duster. First time fabricator and welder so it’s not pretty.
Also, I found that there is ample space between the dash and firewall for an air water intercooler(1200hp frozenboost). But once again, different cars.