Without reading every reply I do know the last set of 675 heads I pulled off a stock 318 motor cc'd at 68cc.
974 were around 72cc. If you install seats, the chamber volume drops now the valve sits prouder, same for larger valves ,generally. A lot of shops mill .003-.005 unless requested, some charge more if so.
I'd do the 974 heads, 1.94/1.60 bowl/turn work.... oh wait, it's not me... okay, 974 heads with a valve job and .045 milled off them deck and face..
It is possible the 325.00 is a guides knurled, valve job and mill...and you misunderstood or they didnt explain well.. good luck.
