David Vizard an accomplished engineer heavy emphasis on cylinder head tech. has recommended a 60 degree throat cut 45 degree seat cut and 30 degree transition into combustion chamber. keeping a 45 degree seat cut at .050 thickness
Those angles may be good for SBC or some aftermarket heads but that is a very rough simplification. The Chrysler Racing Manuals call for 15* top, 45* seat, and 70* bottom angles for a SBM. 0* top, 45* seat, and 70* bottom angles for BBM. Those were recommended if limited to three angles. If you listen to "Class" racers, they will give different angles depending on the head casting. Those are the guys to listen to.
