as far as snappier than a 350...depends, a stock 2 barrel 350 ? stock late 70s truck 350? not all 350s were fast. the 305 I built for my Caballero ran 13.70s...thats snappier than alot of 350s,of course $ for $ a 350 would be faster.
350 heads on a stock piston 305 would only be a good thing if there small chamber Vortec heads or L98 aluminum heads.