Help!Is the stock EFI enough, 74 EFI ?'s Options

[Gunn1]

I Recently purchased a 74 914 (VIN 4742901009) with what I believe originally had a 2.0 liter installed in it (original engine ID 006765). According to the seller the stock engine had one of the cases busted when it had thrown a rod through it. He went on to say he purchased a case (W0111578 ID found in front of oil filler) and took the remaining parts from the original engine to a shop here in MPLS. there they replaced the main, rod and cam bearings. Blasted-polished the crank and rods. installed a 30mm high flow oil pump. Honed the cylinders & installed and gapped new 94mm ring set. Replaced worn camshaft with a new "IV" mechanical cam. At this point the car is not drivable for structural reasons but the engine starts idles, throttles up down and sounds pretty good. The car came with what looks like the 1.7 type air filter set up and the throttle body which sets horizontal rather than the typical vertically positioned throttle body with the larger square type air filter set up.
With all that important info out of the way, I have many questions. Is this a 1.7 injection installed on a 2.0 engine? if it is, is it a huge deal? Will the 1.7 injection automatically adjust to the larger engines demands for fuel. Most importantly what specs do I use to tune the engine? Thanks Gunn

[r_towle]

No, it will not autmatically do anything, it's from the 70's.

Basically there are several hard coded (hardware coded) air/fuel maps.
Cold, warm, and hot.

To tune it you will want an external air/fuel meter with either an 02 sensor installed, or what I do is stuff an 02 sensor into the muffler.

This will give you a better understanding of how the motor is running.
You will not get a good set of readings unless you do this under load, driving or on a dyno, because one of the main sensors is manifold pressure and that changes dramatically under load.
The rest of the sensors are simple to test with a multi meter.
Read this site attached, it's considered the bible.
http://members.rennlist.com/pbanders/DjetParts.htm
Rich