hey guys, i have a 454 big block in my 67 camaro. i got new big block tall valve covers but they wouldn be able to fit with the 11 inch power booster, i have seen once before a 69 camaro big block with a 9 inch power booster and a extra booster mounted on the wheel well. Can anyone tell me where i can find that extra advance booster and what type i may need?

Thanks,
Mike