stroker life span?

? im pretty sure a 340 with only 8lbs of boost wouldnt reach 1000 hp. Why would I buy an aftermarket block when mine is just fine. 600 hp would be the highest Id want to take my stock block. Id probibly aim for 550. Thats all im really looking for. If the FI 340 will last longer than a 416 stroker than thats what ill go for. EFI will come later down the road after ive played with the blow-thru and saved up enough dinero. I can fab up most of what I need. Plus, I already have a garret t3/t4 hybrid turbo... thats the only reason why I would even consider going FI.