if you do end up going to a carb setup, a 4 bbl with small primaries will get you better fuel economy than a 2 bbl. a 600 to 650 cfm should be all you need to deliver enough fuel to a 302. if you were to buy the parts new, i'm seeing an overall cost of $420 for all the necessary parts when sourced from different sites on the internet. that cost can be reduced considerably if you keep an eye on craigslist.
and i would go with an orange, black and silver harley davidson paint scheme. i'd paint the whole truck black, put the orange down the center of the truck following the raised portion of the hood so that it covers the roof and continues to the tail gate and also put the orange on the sides(where your truck is currently silver), then put a 3/8" wide silver pin-stipe where the orange and black meet. i might even consider leaving a 3" to 6" wide black strip down the center of the hood, roof, and tail gate with the silver pin-striping lining it so that the orange becomes racing stripes. but if i were to do this, i'd also convert all the interior to black.