GENI Vortec 350, TBI, 400hp with stock injectors?You can build a Gen 1 cheaper and with more power than an LT-1, plus you won't have the optispark nightmare. There are quite a few companies making aftermarket injection setups. The Vortec isn't bad, limited to about 400hp or so with stock injectors.
Keep looking for an LS based engine. They make great power and the aluminum block and heads can sure help with weight/handling.