Someone tell me I ordered the right thing please

How did You get an A 'cuda up to 3700#?

Right!

I was shocked, and reweighed it on a second scale. They were both within 50 lbs of each other.

Here's what is in the car that makes it so heavy.

Aluminum headed 408 Magnum with full 3" TTi exhaust, vintage air A/C, 2004R trans with bolt on bellhousing and 3600 rpm lock-up converter, 4" Mark Williams 1350 driveshaft, Dr Diff built 8 3/4" with his Econo Disc kit, front and rear sway bars, 11 2/4" police taxi front discs, a full US Cartool Chassis Stiffening kit, a 4-point rollbar, Corbeau bucket seats, a four row brass radiator, 2 trans coolers and 15" steel rims.

Even with all this stuff I was thinking it would be around 3300 lbs.