if i was you to save on cost, run the stock 350 radiator and over flow tank with efans. i spent 250 on my efans an harness another 100 on JUST the jug another 20 on the cap and they wanted 100 for the hose with the Y in it for the jug, water pump, heater hose. i i was to do it again thats the way i would have gone.
as far as the fuel pump, yes a stock replacement will work but i spent the 200 on a Walbro 255 with hot wire kit vs a stock fuel pump. just my .02

3:73s will be good, im going 4:10s anyways! i need the gear to make up for the lack of converter (its a 2600-2800) im not willing to pull the tranny just to restall it. besides, its just a DD lol