I can think of better throttle bodies as the cossy one works I agree however many complain of a dented bonnet.
I personally would use anything but.
an advantage of the cossy one is that it has the iscv built into the body but the downsides are they dent your bonnet.
I am yet to see someone with one fitted not complain of a dented bonnet.
as said I use a Vectra/calibre/cavalier v6 with an external ISCV.
if staying cossy id be inclined to buy a new iscv anyway.
as for OHMS across the pin range I cannot help, try messaging rsmat on here he should be able to test across his on his rst for you