I've got nearly 150 miles on the car now. Working on getting the EFI dialed in closer. Think I have the fuel map close, very little Closed Loop correction going on now. Found out the timing map I used was for a LS1/2 which from what I could find like more timing than the LS3. Redid the entire timing table to lower the values in the idle and cruise areas of the map. Seems to have helped, engine will tolerate being lugged some when letting the clutch out better than before. Data logged the cold start up last night and am going to work on that now.
Overall impression is Wow, it drives so nice! The T56 is smooth and easy to shift. 5th gear at 60 mph is 2000 rpm. 6th gear at 72-74 is 2000 - 2100 rpm. Car is very quiet while driving, in fact with the windows up I have to watch the tach more as I can't hear the engine well enough to know when to shift. Ended up with 5.5 degrees of caster and 0.25 degrees of negative camber for the front end, drives very nice and straight doen the road.
A couple of annoying thing I have noticed,
-The quick ratio steering box combined with the smaller diameter steering wheel won't turn the Ididit column enough on a normal RH/LH turn to cancel the turn signal. Not sure if there's a fix for that.
-Don't think my idea of hiding the old mast antenna under the dash will work well. I does pickup stations but poorly. Might have to look into a better hidden antenna. Or forget it altogether and just stream live radio from my phone to my bluetooth amp...
-Carpet has developed some wrinkles, will have to have my interior guy steam it out again.
-The inexpensive Holley 92mm throttle body I bought has a very annoying HISS when the IAC count get above 25 or so, which is what the engine needs during cold start up. Did some research and looks like I can port the passage bigger and smooth the sharp corners to make it quiet down. Going to tackle that this weekend.
Went to a small local car show in Stone City IA over the weekend. Beautiful area, it's where the artist Grant Wood used for a lot of his landscapes.... anyway won a Best of Show Trophy! I'm not into the trophy thing but it was a good acknowledgement of all the hard work.