Not really plug-n-play but still very easy.
Starting from the throttle cable.
I think my gas pedal / arm was slightly mis-aligned from the factory so I had to modify the mounting holes inside the passenger compartment to make the cable line up with the hole in the cable. It was about a ¼ inch to the left. On my 280z when I did the same thing years ago it lined up perfectly. In this case it was like the mounting pad was canted slightly counter clock wise and the gas pedal was very close to the trans tunnel. You most likely will not have this problem.
Drivability? Don’t know yet just got it hooked up this weekend but seem to be running really good so far. Word of advice here, replace your intake/exhaust manifold gasket, I thought mine looked good, big mistake. Had a huge vacuum leak.
Any heat issues with fuel percolation etc? Don’t know yet, I used the factory hard lines and just blocked off the forward outlet. Removed the heat shield so I may have an issue, we will see.
Did you have to drill any new holes to mount a cable? No.
Did you cut off the original bellcrank and bracket, or just route next to it? Just ran thru the hole next to it. Did not cut anything off.
Throttle return spring. I took the easy route and made a bracket to connect it to the fender well on the drivers side.
Tips I got from Dave at AZ. Connect the power brake hose and the vacuum advance hose to the manifold NOT THE CARB! Use a breather filter for the large vent under the water outlet, do not connect the valve cover vent to the carb base, run it to the air cleaner or put a filter on it.