17 and in need for power!!
I got my dart when I was 19, this is the first summer I have driven It, and I am 20 now...It takes alot of work to get everything working right, and doing anything to the / will take it our of commission for a while, and I don't think you want that.
With mine all I did was take old 318 out and put in a 360. To get your mind set on what the car will be just start planning out the 340, I remember with mine I was looking for parts to build it and slowly started collecting them.