Hi,
Gary did the machine work on my "6". However, there is no way a 274" Buick will put out 650HP without a power adder. Jim Ruggles was "the man" on these motors (along with Gary) and they got them up to 535 or so with 14 to 1 compression. My motor is VERY detuned at around 470 with 11 to 1 compression. The good news is it gets better than 20 MPG on the highway
I also vote for 11/7
Regards,
Bob