here we go demon engine bay

hello how are my name is TOM and i am sarting my demon i have a 72 demon had slant 6 and 3 speed on the floor i am in the process of gutting it right now body is in really fair shpe got a little rust in it and a lot of surface rust it is blue blue blue i am wanting to change the color over to sublime green and black put rear spoiler on and hood scoops is there any advice you can give me i am also wanting to change the motor from a slant six to something not sure what to go with any ideas i am not wanting to sink thousands into the motor i am not looking to race i want sound and to burn the tires off and am not wanting something i have to work on all the time i brought this car back from oklahoma city 1 owner car i am the second i actually have the original title that tells what it had sold for it is really kinda cool old lady bought the car new i am not wanting to tub this car or anything i am wanting to keep it street legal but put it on the edge and make it what its name is thanks if you can help any