Holley 390 and Offy Single quad intake questions

Everything you ask is do-able.But with the larger increase in carb CFM you really need to open the exhaust so it can breath.Yes you can use the stock exhaust manifold.Expect to follow it with a custom 2 1/4 or 2 1/2 system to the back bumper.Dual exhaust is not needed unless it is something you want.Kick down can be done with a cable system from Lokar or Bouchillon Performance.Either work well.With some skill you can make the factory mechanical linkage work. The first slant I did was with a stock internal 225,Clifford intake,390 Holley,Clifford headers,Bouchillon kickdown and a 2 1/2 full exhaust.At the time the whole set up cost about $800 and was worth it.The increase in performance will make you smile.After a year or so I wasn't happy with the Holley and went to a Edelbrock 500 AFB that I liked better.