Or you could simply look up Ronnie Spains book, check out the Gulf/JWA race specs & note that the GW small blocks were doing 205mph/6500 rpm at Le Mans in 68 & 69 in 1074/75/76 , so all you have to do is compute your final drive ratio to suit your choice of tyre then build your motor to deliver-- shouldnt be too hard given the tech is 40 years old- now stop yappin & start building
