I'm not using these headers on Vortex heads, but I think I can answer part of your question. I have been doing a lot of digging to try and find headers for my AFR heads. When I talked to Sanderson yesterday they only carry two types of the CC-13 headers. One is the round port aprox 1 3/8" dia. and the D port aprox 1 3/8" x 1 3/4". They don't recognize the R,F,V,A letters that you see on V8Monza.com. The d-port do work on angle plug heads. If you take a picture of your heads and send it to
helpheader@gmail.com they will tell you if the port size will work. I don't think they will be able to help you with the rest of the questions.