360 vs 383
Stay away half a day and 4 pgs. pop up...lol
To jump in for senario 1.....A well tuned 74' 360 Duster will run door to door with a 60's 383 Cuda ---3.23/3.21 gears. 14.40ish. Not bad for a heavier Duster, so in this case, i'm a 360 fan.
Now to senario 2, I'd probably still stick with the Duster 360 because of the ''mildly'' designation. At some point depending on camshaft upgrades, i feel the small block would require more gear/converter.