I had a timing problem with the spout out, the car woundn't start... timing was off initially, and when commanding timing with MS it would start but not make any power. This is my replay to a post from MSExtra Forum:
I had a somewhat similar issue with a Turbo SBF 302 on MSPNP. Car would not make any power it idle fine and drove fine, but it was not making the power it should (tested at the track, it was only traping 104mph in the 1/4). The car would die with the SPOUT out. I recheck the timing, and it was way off.
Brought piston #1 up to TDC.
Took SPOUT out, and re-stab Dizzy.
Turn on car, rotate dizzy until the car started.
Verify (with SPOUT out) with a Timing Gun, and set it at 10 BTDC.
Turn off, Plug SPOUT in.
Hook up laptop open TS with current tune.
Set Fixed Table to *20
Open Timing Wizard
Turn on car, and check timing with light.
Adjust Wizard offset via TS until I see *20 BTDC timing mark.
Set to USE TABLE, and burn tune..
I ended up with 10* offset. But that was my case.