SmallBlock engine swap on a Mopar A-body with headers.... Never Again!

I'd like to see something specific like a 410 sb that turns 6800 or so , real heads,with 1 5/8 deemed to be generally "too small" headers...then smash on those and tell me how the upper rpm range is effected.
That's depending on airflow camshaft , and real compression, wouldn't it ?