If you understand tuning carb and distributor cars, you have a basic understanding of ECM engine management. You are looking to achieve the same thing. Only the ECM can do it faster, and make many adjustments per second. Tuning a non- ECM motor is like using a chain saw for brain surgery.
Its a vast compromise. The ECM can optimize the operation of the motor over a large spectrum of operating conditions.
The VE table is your "jetting" and the SA table is your distributor advance.
You will need equipment and software. Stock ECM is not "flash" capable, so a ROM emulator is strong recommendation. But before all that, go here
http://www.thirdgen.org/forums/diy-prom/ and start reading. Particularly, read up on the stickies at the top.
http://www.thirdgen.org/forums/diy-p...uide-book.html
Doubtful you will find anyone who can/will tune the LT-5 outside of our community here. The LT-5 isn't very different than any other "speed density" motor, just has some quirks to it because of secondaries etc. Then the question is "what kind of tuning?". WOT tuning is one thing, driveability/part throttle is much more involved and time consuming. And we spend so much more time at PT.
Also attached a copy of presentation I did on tuning LT-5 at 2014 Gathering.
I am warning you however that this stuff is like heroin for gearheads.