I don't know Joe,seems like it should run in the mid 16's, but as you said in the email,your carbs may be too small and you may need to rev it much higher to make use of the cam.I remember at the drag strip in the 60's-70's mom and pop 6 cylinder cars ran in the 18's.There are fast Chevy 6 cylinder vehicles, but they are all out drag cars, unstreetable.How does it run on the street, drag strip times aren't always a good indication of street performance where are more interested in passing power and roll on performance.