So in brief-
Mechanical work all done
turn the key - Stack flashing like it's the Blackpool illuminations
The Stack calms down and I hear the pump working and various other familiar noises
so try to start - nothing happens =

struggling to charge the battery, it seems like the alarm is trying go off constantly!?
So in not so brief-
Everything is put back together, I reconnect the battery (having previously disarmed the Cobra 6422 alarm then disconnected battery) I disabled the alarm, sounded fine (clicks and buzzes) but no flashing indicators. Turn the key so the dash lights up - whole thing flashing away like I've crashed the car. We put on a new fuel filter so my dad held the disconnected fuel pipe expecting some fuel to come out - that didn't happen so reconnected it.
Tried starting, nothing happened.
To complicate things, at this point I realize the battery (which is a dry battery) has different characteristics from normal ones. At first it seemed fully charged but after a few minutes I could tell it was rapidly losing power. So I put it on charge, 'hopefully' before the alarm lost power.
Now the strange thing is, while it's charging I'm hearing the alarm clicking inconsistently. Keep in mind I have the siren disabled - so the indicators normally tell me what it's doing. But they aren't coming on even if I switch them on with the stalk. Fuses all seem fine. Headlights do come on.
So it's still charging and the last time I turned the key it was just a repeat of events with the crazy flashing Stack.
Thoughts!? (besides sticking it on a truck and sending it off to a garage)
cheers
Scott