best deal going for those not looking for a career change into building engines is this..
https://www.chevrolet.com/performance/crate-engines
new, factory, warranty, dealer support, etc..
they offer a decent selection of bone stock to mild, reliable performance upgrades..
there has been a lot of chatter about west coast engines but they're pricey rebuilds..
I backed off from considering them due to several accounts I've read of unhappy buyers..
factory crates available at select dealers around the country, pricing varies slightly..
summit, jegs, etc.also sell them..
this is about the simplest, least hassle, highest odds of success formula for the average guy..
good luck!