Remember that GM and Fords were mostly full frame cars. The fenders, inner fenders and radiator (core) supports) were all bolted on and not a welded on part of the car. That is why they were painted black when the parts were made.
but if they make V2 hemi orange in spray cans LET ME KNOW!!!
Clean the engine bay good, Sand it down with 320, Lay down a coat of Epoxy primer reduced as a sealer then lay your color over that.
You can do it with a quart of primer and a quart of color. You should be able to buy the paint and primer for under $200.
ehhh thats alot....I rather paint it black and spend that on the motor, but I primered it already and It only took 2 cans, So I think Ill Stick with spray paint and just tape everyhting off well.