JB weld, flex seal or full rebuild ?

I am thinking of going with the stroker kit..forged crank, forged pistons and possibly a roller cam..I would like to be in the 460- 480 hp range. My car has 3.55 gears with 26 inch tires and a 3000 stall converter.. I want a real quick street car, btw my block is an early LA if that matters, and the car is a 72 swinger
With a 4" stroke, it'll be quick alright.