Hi Alan, you probably don’t want to hear this, I have no authority or experience to rely on. I’m selectively optimistic, and I am being selective with my unsolicited input below.
I think you should seriously consider dropping a 3.0 carb motor in the car. Buy a known runner for $1,500 or less. Enjoy the car for a bit, and do a shakedown on the rest of the chassis wiring, suspension, brakes, etc. Your motor is a blocking issue.
Bench test the wiring, and the motor. That quote is $3,500 worth of work, but it is what I like to call the “happy path”, not a realistic final figure. Before you even mess with the motor, see if you can buy or build a stim for your EMS software. You can then build a 30 degree stand for your motor and test the engine wiring and tuning. If needed can wheel your motor to the shop and continue to enjoy your car.
Example Stim:
DIYAutoTune
www.diyautotune.com
I’m also worried that after you get the engine to fire, it is still possible that you could have issues with the engine mechanicals. I know that you bought the s38 from a builder. Correct me if I am wrong, but he is not around to warranty the motor or address any issues. You could drop $4K on wiring and tuning only to discover a motor issue.
This doesn’t go away with the approach above, but it may be a way for you to protect and refine your investment while you decide on next steps for the motor and EMS.