Justin here. I've been well verse watching bill make 3800's special. Been to his house multiple times and helped and watched many modding sessions. Funny part I've worked on other people's cars more at his house than I have had him work on my own ha.
Just to let you know what I have done which might interest you.
On others.
Gen III to Gen V swap including modding the LIM
Engine pull for a cam swap
Non modding Maitanence. (i.e tune ups, suspension, ect)
All these cars are running strong on the road.
On my car own car. (97 Bonneville SE)
Swapped in a Series III, GT2 cam swap, LS7 lifters, LS6 valve springs, self P&P lower intake, and replaced the heads.
Converted from a 4t60 to a 4t65-HD
Waiting in the wings are headers, full 3" exhaust, and a Series III upper with a N* and HV3 (waiting to get out of my sling from shoulder surgery)
I have a tuner but my abilities are not super strong yet but we will be able to keep the car happy.
Bill is a monster in the 3800 field. I haven't gotten my trans swap times down to 4 hours yet. But a nice perk is my zip code is 07748.