On my build I went with Probe SRS pistons and Ace's 4340 rods. Much lighter parts than the stock pieces. The 350 crank still needed a lot of material taken from the counter-weights to match the bob-weight.
I think my crank was a 350 casting but was machined and balanced at the factory as a 400 crank. Best I can figure out anyway.
FWIW, Stewart
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1976 TA, nose converted to 1970 style, 406, ported #13 Heads, '70 iron intake without crossovers, Q-Jet - Cliff style, RARE OS manifolds, Pypes duals w/crossflow, UD 230/238 custom HR 4/7 swap cam with solid roller lifters  , Hydro-Boost 4-wheel discs, 4 Speed, 3.23 posi.
“Nothing in life is so exhilarating as to be shot at without result.” - Winston Churchill
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