[Tom Goldman]

Aftermarket front sheet metal is substantially lighter than stock ,as it the radiator support . ...Add the lighter pump,battery and master cyl and you have a substantial savings in weight ,but not your wallet.
Aluminum seats can save as much as 70 pounds and offer more safety.
As Jimmy said 50/50 really isn't necessary , I regularly have to twist arms to put weight back on the front of Stock and S/S cars