318 f.a.s.t class , oem stock appearing

i like the nitrous idea , i dont know how to hidden that stuff and never drove a engine with nitrous , why can it be so hard to run with the 2bbl intake and carb even if its modified ? i didnt tought it was that difficult , i have two ideas , 1- to stroke it to 390 cu .in or or to buy aluminium heads and to port them to the max , still using 2bbl intake and iron manifolds ( dont forget that i want the intake to be massively ported and the car modified to maybe 500 cfm or more )