351 4v sniper EFI timing

[Parker.Risques]

I have a 71 Mach 1 with a 351c 4v M code. It currently has a holley sniper EFI, a mallory distributor, and a super stock ignition coil. Does anyone have suggestions on what to set the timing at? I've been having trouble with the spark plugs fouling up quick and losing power while driving and I think it could be a timing issue

 

[c9zx]

!6 initial 38 total mechanical, limit vacuum advance to 10. ANY exhaust leaks will cause it to be rich because the O2 sensor is seeing lean. Chuck