As far as weight goes, I haven't been able to put it on a scale but here's some thoughts to ponder. Figures put a stock big block 1971 Charger at about 3900 lbs.
I'm in the process of putting her on a diet, including:
aluminum heads
aluminum intake
mini starter
fiberglass hood
lightweight front racing seats
removing all the air conditioning components
replaced heavy hidden headlights with lighter exposed units
lightweight insulation
headers (dont know if that saves any but cast iron manifolds sure are heavy)
That's the start, I'd like to get it down around 3500 but I realize that's a pretty ambitious goal. The good news is my 135lbs wont contribute much to the race weight