Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 77 Trans Am Restore 403/6.6 OMG INTAKE › Re: 77 Trans Am Restore 403/6.6 OMG INTAKE November 6, 2012 at 3:40 am #474726 619DioFanParticipant In all honesty I personally would not waste any money on that block. as I mentioned earlier p/u a 455 ( earlier the better ) and build that.