Originally Posted by BBCMudbogger
drain the oil, put the known amount in and mark the stick wherever it reads the oil line after of course your +1 is in the filter
Normally I would agree, but since you can buy at least four different filter capacities, and different manufacturers have completely different guts, assuming volume of a certain filter is not a good idea if you're going for accuracy. There are filters that hold just over a pint all the way up to 1.6 quarts for some of the tall van/truck filters.
We've beaten this to death with mix n match parts that we can't know without further parts.... since you have to buy parts anyway, why are we still trying to make a 25-cent dipstick work?
Listen... take a 1/2" wrench and $2 to the junkyard. Pull a dipstick out of any SBC or 4.3 V6 with the same dipstick location as yours. Take it home and compare the length of the oil level mark down from the seating bulge in the tube. That measurement is standard for every small block ever built. Don't guess.... Know.
Or, if you want to skip the work, go to the parts store and shell out $17 for a new set that you know matches.