Pipe dream motor swap: What would you bolt into your A-Body?

For the street : 4.0L/258 inline stroked to 271 cu.in. with a hydrolic overdrive trans , optional Pro-charger set at 9 lbs. of boost . Out back 8.75/9" with 3.50 r&p . Modern wiring , take this puppy on a road trip of a lifetime . Dual purpose : 6.1L Hemi , overdrive trans., 3.90-4.10 r&p , a fun ride . Serious effort race only : Indy/Ray Barton 427 small block , 727TF manual with brake , 9"/Dana with spool , 12pt. cage . Run car in index classes , either 11.50 or 12.00 pro start . I got a million of 'em .