I went searching on Jeg's for something else, and this popped up:
http://www.jegs.com/i/Chevrolet-Performance/809/12530283/10002/-1
This is the engine I have recommended several times. Right now it's $170 off list price. All new with Vortec heads. The only thing wrong with it is that it is not drilled for a mechanical fuel pump. The stock cam is rated at 250 HP, but it's a roller block, so you can reuse all the lifters and hardware with just a simple cam change with up to 0.465 lift. Includes tin and a balancer. I'd buy one, but I have the 2-bolt version sitting in my garage that I bought years ago and have not gotten around to installing and that's an expensive way to get two more bolts on each main cap...
http://www.jegs.com/i/Chevrolet-Performance/809/12530283/10002/-1
This is the engine I have recommended several times. Right now it's $170 off list price. All new with Vortec heads. The only thing wrong with it is that it is not drilled for a mechanical fuel pump. The stock cam is rated at 250 HP, but it's a roller block, so you can reuse all the lifters and hardware with just a simple cam change with up to 0.465 lift. Includes tin and a balancer. I'd buy one, but I have the 2-bolt version sitting in my garage that I bought years ago and have not gotten around to installing and that's an expensive way to get two more bolts on each main cap...