TTI'S + Oil Filter
I've been drilling and chamfering an extra set of holes in my plates also.
As for the screw-in double-ended nipple that retains the plate and the filter screws onto, the one out of the 90* adapter will work.
If you are concerned about the proximity of the filter to the headers, there are 2 different "short" versions. I believe a Dodge Dakota V-6/V-8 version is a little shorter than the '70's V-8 versions.