I was told that the 350 in my 74 Monte would benefit from Vortec heads, Vortec RPM Intake, 4bbl and Comp Cams XE-268H cam. What else do I need to complete these jobs? Timing chain, cam, intake, carb, heads, and...? I know springs etc. come on the complete Voretec assembly, do I need Rocker arms? What kind? pushrods? etc.? Thanks for all the info!