TCI Flexplate for me, they come powdercoated grey, take a grinder and take the powdercoating off around the converter bolts and the crank bolts.
SFI is a sanction deal, some classes require you to run SFI.
Starter, get a hi-trq starter for it. If your killing flywheels and starts it could also mean a few other issues, ground, low voltage, or timing.