I've got a built LT1 383 with a TC78 turbo and EFI connections LS1 PCM. It runs with the stock LS1 computer tune, but not very well. I'm getting it tuned on Monday and was wondering if there is anyone who has done this and if they would share some tips. Here are the specs to my build.

Cam specs.
224/224 .577/.582 114 LSA
This is the MAF I'm using, but mine is all aluminum. It has the IAT sensor built in. This website has tables for tuning,
http://www.powrmax.com/PowrMAF%20100.html
I don't know what boost I'll be at, anywhere from 10-15psi from what I'm told. I'm not looking for a particular hp or ET or boost level, so whatever springs I'm using now will be fine for a while.
I'm using a LT1 style monoblade throttle body with the LT1 style IAC and TPS sensors. I have a 3 bar MAP sensor.
I have an adjustable fuel pressure regulator set to about 42 psi at idle. Twin in-tank walbro 255lph fuel pumps, one set to come on at about 5-6 psi. Fuel injectors are Siemen Deka 80lb high impedance injectors.
Ignition is a LSI PCM with D585 truck coils (lower dwell time) and MSD wires with iridium spark plugs gapped at .031"
Rockers are crower 1.65.
Springs are Comp 26094-16. Seat load: 178lbs @1.900''_Open load: 459lbs @1.275_Rate: 449lbs/in
I'm using LS7 lifter with about .00416" preload.
Fans are Flex Lite 410's.
Tranny is a built 4L60E with a 2800 stall.
Rear end is a 12 bolt with 4.11 gears.
Compression ratio should be around 9.2:1.

General Engine Specs

1997 .030" over 350 LT1 out of a Pontiac Firebird
230cc Brodix LT1 Cylinder Heads w/62cc Chambers
Fully CNC ported intake/exhaust/combustion chambers
Cometic "MLS" Head Gaskets
ARP Undercut Head and Main Studs
CP Pistons & Pins - 24cc Dish (Approx. 9.0:1 comp ratio with 62cc heads and .040 gasket)
Total Seal Piston Rings
Manley 5.700" H-Beam Connecting Rods
Callies Billet Steel Splayed 4 Bolt Main Bearing Caps
Callies "Stealth" 4340 3.75" Stroke Crankshaft - Internally Balanced
Fluidampr 7.5 o.d. internal balance 740101
Cloyes Double Roller Timing Chain
Canton Road Race Oil Pan, Melling High Volume (10%) Pump Mel-10552, and Canton Pickup
Trickflow 7.3" Chromemoly One Piece Pushrods TFS-21407300