I have the volumetric displacement of the Charger, so it is very easy to calculate the size of the pulley that I need yes.....
the pulley in that drawing is for a 2000cc displacement into the 1308cc of the 13b engine, theoretically giving me the performance of a 20B engine.... I am somewhat limited with the amount of pressure I can run as a result of the engines 9.4:1 compression ratio, might have to get me some turbo rotors...
the inlet manifold is going to be made of Aluminium yes. got my hands on a very nice TIG welder....
some nice smooth 57mm 90ยบ Al bends, and it should be a fun project to see what the TIG welder can do.....