^^agreed
Take my word for it do small stuff first: steering, suspension, brakes, and elecrtical.
My skill is in midrange which came from experience with working in the industry for 7+ years. I'm still learning things that I didn't acquire from all my training.
I did a L28ET swap into my Z, and that in NO way should have been one of my first investments, as I have come accross issues with brakes, steering, and suspension being not all too efficient. And thats just a L-series motor, granted I may be pushing a few more hp than stock, I did everything ass-backwards.
I've been all about HP and going fast, and completly forgot the basics of modifications and doing them in a logical order.
I recommend start with brakes, suspension, differential, then start moving towards your motor. And when doing so, make a personal checklist validated by someone whose done the exact same swap (ie: rb25det into whatever year your z is). I recommend this because even with all my research, and all of the endless threads on here pertaining to motor swaps, there will be something missed or may have not been included, that you will stumble upon as your doing it.
In either case GL with your Z endevor