shttygtstng said "but y should i be concered about all that weight. " If we have to explain that to you, you need to go back to remedial physics. You have to accelerate it. You have to stop it. You have to turn it. Weight is ALWAYS the enemy.
Smock - you'll have to get over yourself on this one. The Stang is already a joke with regard to weight distribution - most of 'em come in right at 58%/42% - almost front wheel drive territory. The 460 block is bigger, the crank is bigger, the rods are bigger, the pistons are bigger, the intake is bigger, the headers are bigger --- everywhere you look there's more weight. Even with the stock 302 the car should have the engine set back about 6-8 inches, and about 100-150 additional pounds shifted to the rear to have a more reasonable front to rear weight.
The 460 is TOO HEAVY if you want a car with any kind of reasonable front to rear dist. and balance. No way around it. As for mileage - a smaller displacement/boosted motor can equal power output and be MUCH more fuel efficient when your foot is out of it. Any way you go - the small block wins. Just my opinion. And since the forums are public - I'll keep posting about it. You'll have to get over it.