AJ's Opinion; what size SBM do I need

There no replacement for displacement, it costs the same to build a 360. You can bla bla bla all you want but a 360 core is where I would start.
I hate giving ppl the red x and out of respect to you im not going to but j disagree with you. The whole bigger is better thing is gone the replacement for displacement is airflow!! Look at all these 5.3 ls engines making 1400 hp with turbos and stock bottom ends! The 5.3 is only 9 CI bigger than a 318 and they are making crazy numbers with them simply with boost! The same can be done with 318s! Granted you can do the same to the bigger ci engines and get similar results but my point is the small engines can get there too. Its more about tuning and efficiency than the biggest engines you can stuff in your car. @318willrun has taught us all that.