did the 273 D Darts Cly just std production?

and if so,

if i built a 318 to these specs using that cam shaft from the d dart or similar

495/505 lift ( something like that)

is it posible to get 1 hp per cubic inch?

D dart= 275HP 273 CID..


here are the 273s specs..

......................Charger/Commando................D/Dart
Horsepower...... 235 @ 5200 ......................275 @ N/A
Torque............ 280 @ 4000 ...........................N/A
Camshaft I .......... .425" .............................. .495"
E ....................... .425"............................... .505"
Duration ................248º.............................. . 284º
Overlap ..................46º .................................N/A
Carburetor..... 625 cfm AFB....................... 750 cfm Holley
Exhaust........ cast iron manifolds............... headers by Doug
Warranty........5 yr/50,000 miles...................... NONE

Im just currious how the 318 would run is all..

what do you all think?