408 or? need help...

[baezi z06]

hi i´m from iceland i´ve got Z06 2004, whith a little damadged crank, and block, all fixable, but i´m not trusting this things any more, had before damadge on two pistons they slammed upto valves, so i´m now in 2nd time opening the motor the cause of damadged now on the crank and block , was piston bolt got loose and so on ..... just wante new stuff. (bigger.....) I had dynotest of the (346) motor 424rwhp at 6500rpm , it is ls6 whith TFS215cc and Comp cam 281/283 232/234 .595/.598 112 LS, very high lift in that motor, made trap time 123.6mph the 1/4 mile and then harland-sharp 1-7, MSD, Mt1 ramair, kooks headers, no cats, ls6 throttlebody and ls6 intake manifold, spec 3 clutch (hurst shift) not sure the numbers on the injectors (but they are not orginal, it´s often rich of fuel, never lean) so i´m looking for the best small block stroker, that i could buy and use whith my other stuff. and then in the future will do mods(bigger fast, bigger cam and maby no2), i´m both driving and racing.would like it hard core.... have been looking at 408, and 416, 418. what do you think, ? need good performance result but... low budged , and able to use my other stuff for now..., and need fast deliverie whith fast shipping to iceland kv baering