What kind of car is this?
1996 Pontiac Grand Prix GTP with the LQ1 engine, they only built 5,100 of them and of those only around 1,000 had the factory sunroof as mine does. The engine is wedged in there so tight you've got to drop the engine cradle to get to half the stuff. The alternator is slightly below and behind the passenger side wheel so not only does the inner fenderwell have to come out but something in the front suspension components is in the way too and has to be removed. Somewhat design testbed for the Northstar as far as the valvetrain setup so they did use it for several years in the few early Pontiac Grand prix GTPs, Chevy Lumina Z34s and three years of the Monte Carlo Z34 models. (but there was a bit more hood room under those)
Very few still exist because, despite their reliability, little things like alternators and power steering pressure hoses did fail (also an engine drop repair situation) so not many owners were willing to pay to have them repaired, nor did many of the mechanics want to work on them so they'd usually pad the bill with stuff hoping the owner wouldn't bother.
It also gets so hot back there there's actually a small piece of air duct hose driven by a small electric fan just to supply extra cooling air to the alternator. When they changed the body style of the Chevys back in 1995 they dropped the electric fan as they found enough room to increase the cooling duct so it just had a small air scoop behind the passenger side headlight.
It was a true 60 degree offset V-6 but even with the symmetry they still included a sal balance shaft. Timing chain reduced the crank rpm by half and drove the balance shaft which also drove the timing belt. The timing belt went on to drive the four camshafts and required several idler pulleys. You had to have some special GM tools to change the timing belt or you'd never get all four cams back into sync.
When they first made the engine they could get over 700 HP out of it which was unheard of for a 3.4L engine but once it made towards production that had been pulled back to 300 HP then, as is often the problem with GM cars of this era, they had to pull it back to 215 because they couldn't make a transmission to handle it. They're relatively easy to tweak back up to 250 and if you want to start bolting on parts you can make a screamer out of it.