Which engine to go with?

[scherp69]

So I am undecided what engine I should go with. I'm currently building a pro-touring 68 Acadian (exact same thing as a Nova for those that don't know). It will be used 99% of the time on the street with the goal of getting it to the track one day to see how it does. I want a motor that will be as close to or over 500hp as possible. I know I want to do a LS conversion, and here's what I been debating about lately. Keep in mind these are Canadian prices.

Choice one is the GM 480hp LS3 crate engine. I can get it for about $6800 CDN. Engine is all aluminum and comes with car intake. Still would need to get a wiring kit for it.

Choice two is a L92 with cam and intake upgrade putting it to about 525hp. Will run about $7800 CDN. Engine I believe is all aluminum and has LS3 heads. Still would need to get a wiring kit for it.

Choice three is a Mast Motorsports LY6 with 480hp. Can get it with a car intake upgrade for about $8500 CDN. Engine has a cast block with LS3 heads. Comes with the Mast wiring controller which is apparently really easy to hook up. Engine is already broken in on the dyno.

Choice four...help me out if you think there's a better option for around the same pricing.

If you do make a selection or have an opinion, I would really appreciate it if you told me why you think I should go that route. I don't know much about LS engines at all so this is all a learning experience and any info would be greatly appreciated.