how to port swirl ports

looked at my head casting and 4343923, which is what the interwebs tell me a swirl port head for the 360


The best non-Magnum 360 heads are the swirl port roller cam heads with large pushrod holes that were found on 1988-1992 360 trucks. Look for casting numbers 4448308, 4323352, 4343923 and 4343964. They are commonly called just "308s". Mopar guru Rich Ehrenberg really liked them and said that the chamber and intake port are almost identical to a 340 “X”casting. He also said that the exhaust flows about as well as a W2 race head.

i stole that from another forum and im happy all of a sudden.

but.. how would you port these or should i say improve flow if i should even touch them?

supposedly this means the motor was to be roller lifters.. but theres no lifters in my motor. how does this affect ordering parts? (cam etc)