mate.... nothing racey about the zz383.... it is very mild.
I am running a 383 with etec-200 heads and firstname.lastname@example.org cam with 0.594 lift ..... quite a bit more than the zz383, and I regularly do 200 mile weekend drives with no issues. Just make sure your cooling system is in good order. I installed a Dewitts alloy radiator
An overdrive gearbox is also a great mod. I replaced my th400 auto with a 5sp TKO600 box. Exceptional change in character of the vette. The ratios work so well with the additional torque of the 383. I'm getting better fuel economy now with more than twice the horsepower I had before.
Fuel injection makes it all nice and modern, and gives some additional advantages in overall tuning.
Better fuel economy and maybe better torque spread, but I'd doubt you would get much additional peak power. Nice to have, but pricey. Having said that, I too have considered FI options for future.
The stealth ram systems look like a good setup....
Go for it.
Build your car up to enjoy it!