What spark plugs are you running???????can you post pics of them???? Are all 8 fouled???????? oily or sooty????????


Your MSD is a multispark ?? 6 or 7?? Does your EFI adjust timing electronilly??????????? if so you possibly need a locked out distributer---


The EFI systems generally adjust timing by retarding the spark curve by computer and so dist needs to be set to some far advanced point so it can be retarded back to what it needs (ECM can only retard timing, not advance it)


What cylinder heads are on the engine???? good oil return to bottom end??(Edelbrock BBC heads have high level before drain back and can ( do ) cause excessive oil flow down valve stems-----------


Can you see into cylinder thru any spark plug holes? any oil on valve stems/drip??


When engine was put together were the rings put on upside down, wrong groove, low tension oil rings????????( low tension oil rings don't work good on street or high altitudes) Stroker engine---does the oil ring cross wrist pin hole?????????? gap on rails correctly done???????Have seen in some other shops and/or owner built engines destroyed oil rings from improper installation with faulty ring compressor techniques----------


I believe 80/20% probability that you have oiling problem and most likely will need to disassemble engine to fix---if all 8 all fouling , points to 90% wrong selection of parts and/or assembly ----------