If this is an original engine I would check a Chiltons manual for the compression ratio. Am I wrong or does not a blower cram more fuel and air into the engine than naturally aspirated and so I would expect you would want a LOWER compression ratio with the blower. If it starts out at 10:1 and you add a blower I would think even premium fuel would knock and you might need aviation fuel? I would guess you would want a CR around 8:1 with the blower???

Don Shillady
REtired Scientist/teen rodder