after reading the entire post.... i just had to make a post.
a few replies said that the added weight of a bbc wouldn't be worth it in a 3600lb car, and that a 383 could do better...
(just making up numbers, don't hit me)
489 bbc - 600hp, 550lb/ft (aluminum heads - 600lbs)
383sbc - 500hp, 400lb/ft (aluminum heads - 500lbs)
at the cost of 100 lbs, you are getting 20% more hp,, and 37.5% more tq
3600 + 500 = 4100lbs
3600 + 600 = 4200 lbs
weight difference = 2.4%!!!
so your saying that an added 2.4% in weight is not worth the extra 20% in hp??
do some math and figure that in mid to heavy car applications, a bbc is the OBVIOUS choice for getting it moving. just because the power to weight ratio of the motor alone is way off, doesn't mean anything for the whole combo.
My vote goes to BBC. that is why i am putting a bbc in my 3000lb car.
(but... if you are on a $2000 budget, then i guess you have no choice, or you REALLY care about gas mileage, than a bbc will be a bad choice. if you really want to go fast, BBC all the way!)