LS swaps are cheap and easy yes, but everyone does an LS swap. And thats not to say there is a reason for it. I havent completely thrown the idea out yet but Im not too keen on it.
I think Fleming was being minorly sarcastic. LS swaps are anything but cheap and no where near as easy as swapping in a BB of any brand.
I agree with Fleming and lilbowtie, if you haven’t raced much, then do some before you drop the big dollar on building a race car. It’s really sound advice. For that matter, get into something with 400-500hp and be sure it’s what you’re after. Perhaps you already have, if so then disregard my comment.
It would be cool to see a Buick 455 with a Turbo 400 in it. Super easy to install and setup and an ‘almost budget’ 400hp. I agree with you that a 454BBC crate is a very good plan.
Best of luck and looks like you’re at a great starting point.