300 hp slant

Back in 1968, a bloke by the name of Wilford Day set a speed record in a 62 Lancer with a 225 slant, using 3.23 diff gears, with a speed of 145 mph.
A bit later he used a 170 slant, and got 135 mph.....he was using an Isky cam of 320* duration.
This was published in the June '99 issue of Mopar Action.
Wonder what sort of GG's he was gettin ???