From what I remember, the 200R4 is a straight drop in trans that can replace your factory installed PG, short tail shaft TH350, 3 speed Saginaw, 4 speed Muncie transmissions.
You reuse the same driveshaft & cross member.
As far as refilling the water injection tank, that depends on how much you are injecting, what size tank you have, how often you are into boost etc.
I use a standard size GM overflow tank, holds, 2 QTS approx?
I need to refill after 4 or so 1/4 mile passes, but I am also injecting a lot of methanol, so much it changes the A/F ratio.
You can run a small jet as to just use for chilling the intake air temps & not really use that much. 1/2 gallon tank, refill once a week?
EFI systems out now are self learning, really works good & for the guy just get into EFI, would be a wise choice, but they are about $2500 or so.
Megasquirt is about the cheapest, but not the easiest, you need to know the basics & then some.
My friend is a dealer for SDS that is what I am going to be using. http://www.sdsefi.com/
