My advice for you while changing the plugs.......... Put on some mechanics gloves and keep them on. Every time I change plugs on a 3800 I manage to take a little chunk out of my hand, lol.

I don't know about the other 2 cars, but I owned a '95 LT1 and would pull the plugs every few weeks on it because it was sprayed and I like to check the plugs on a regular basis when doing so. Plugs were not a fun job, especially stock but when I put long tube headers on the car, I could get them done in 15-20mins. tops.

The Bonnie is really reallly easy to do plugs on in my opinion for a v6 motor. I have a 1993 SHO as well and that car is probably 10x as time consuming to do plugs because it'* pretty much necessary for me to pull the intake to get at the back ones. I was able to do the plugs on the bonnie without pulling the STB or anything for that matter in 10 mins or less; removal, gapping, and installation included.

Yeah after you get the headers into an LT1 changing the plugs is easier. It'* getting the headers in that'* the problem . They sure are fun cars though...