Bottom end rebuild..

[mongoose]

Rebuilding a bottom end for my 350 and need some input on something.. Not so much building it for power.. maybe 425, but more so rpm... maybe 7 grand.. or so..

I've acquired a bunch of parts that will work except for some pistons..

eagle crank, with that esp coating.. strong as nod crank supposedly...
stock x/o rods with some good bolts..
4 bolt that will get some studs..

now the pistons, I do have a set of TRW L2304F's here.. that I want to mill down flat so they will work with 64cc heads nicely, but do you think they are too heavy to be spinning that fast with those rods? was thinking if i couldn't use these to pick up some hypers, (this is a low buck motor.. everything has been free except labour) would they be any better than the heavy forged units?