I've been happy with the GM 350 HO 330hp crate engine I put in bank in April '01. The block is set up to easily accept a roller cam with GM parts. I converted it to a roller cam (LT4 Hotcam) a few years ago. A word of caution with this engine. This engine has Vortec heads. If you ever get an engine with Vortec heads and you want to put a cam in with more than .480" lift you must do screw in rocker studs and upgrade the valve springs if it hasn't already been done.
I've run this engine hard many times and have taken many trips and never had any issues. It still runs strong, has great oil pressure, doesn't leak and doesn't burn any oil. The Mexicans did a good job putting this engine together. lol. Yes these are "Hencho en Mexico." Better than China I guess.
Like the GM "Gen 1" 290 hp replacement engines, ZZ4's, and GM/Edelbrock crate engines these are decent engines for the money. To bad I wasn't ready to do my LSX conversion, I'd sell you this one cheap.
Good luck in your search!
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GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.
3.54 Dana 44