OK I know this is done to death and I apologize in advance. I'm a huge 340 fan and currently have a mildly build one in my 67 Dart now. 10.5/1 , Eddy heads solid flat 525 lift cam , 1.6 RR , Hooker headers , Eddy Victor intake , Quickfuel 750 race carb , 4 speed with 4.56's. Fun car. Motor is super strong but wanted to start slowly building a small block for down the road. I currently have a 360 block (1976) .030 over that I planned on building a 406 with but then I have a chance to buy a 340 (1970) block but has a sleeve for a decent price. I am looking for minimum 500 HP at the flywheel. I'm a huge 340 fan and leaning towards the 340 but My concerns are the following. Is 500 HP too much to ask from a standard stroke 340? I'd look at 11/1 compression , I'd port my current eddy heads and Victor intake and obviously go Roller cam with more lift and duration. Another concern I would have is if I go with the 408 , Would the 4.56 gears I have be too steep for that? I really don't feel like changing out my rear gear. It's a Dana. The car is driven locally , cruise nights , shows and to work etc. Looking to rip some gears and have fun , maybe take it to nostalgia day at the track. Never was or will be a daily. Just looking for realistic answers. Thank you in advance.