There have been a number of threads recently focusing on Vortec heads, what to do with a stock 305, cheap 350 builds, etc. I might well be the only car-building nerd on the Forum, but in case there are others, here is the GM parts list to build your own hydraulic-lifter 350 using GM parts including stock Vortec heads. GM calls this motor a '300HP' crate engine. No idea what the actual dyno output would be. Instead of paying $3000, you can build this from any cleaned up 1-pc or 2-pc 350 block. Probably for well under $2000. The point of sharing the parts list is that you can use GM pieces or cross-reference them to equivalent aftermarket pieces. Many of them could be purchased on Summitracing.com or Amazon, if you had the part numbers. Enjoy.