340 or 408?

Didn't mean to create this 8 page battle of testosterone , Literally just seeing if 500 hp is realistic in my street car and my options compared to a 360/408. I am looking at the 340 and if it it looks good I'll probably scoop it up. Maybe it's my downfall but again , I'm an old school guy whos ways are out dated but still work and I have a ton of fun driving my car and ripping some gears. Thank you to all who helped me and put their .02 in. Much appreciated!!