In 2008 i had my 440-1 heads reworked from 2.25/1.81 valves to 2.300/1.780 size to try and increase flow some. The first pic/graph shows original porting and 2.25 intakes -red dot numbers from thier bench.
The blue dots are from the 2nd shop where i had the valve work done.
The final pictures are flow numbers from three ports. after freshen up and flow test at 3rd shop. Same valves and port work - 2.300/1.780 combo.