Vanilla MAP-equipped EFI, twin plug and knock sensor will fix all this...those heads ain't the best when it comes to pre-detonation.
SDS is there, it's cheap and it works. Autronic is your local (and pretty expensive) alternative...very advanced. Haltech is old food. Low on cash? Try Megasquirt...
MFI?? Throw it in the river or sell it to some "purist"....
