273ci thoughts?

E58 or EH1 motor option, a 360 with 340 parts:
Camshaft from the 1968 340 4-bbl.
Red stripe valvesprings with damper from the 1968 340 4-bbl.
Standard valve retainers (replacing rotators)
Large Thermo-Quad from Police 360
Intake manifold from the 1978 Police 360
Windage tray from Police 360
Roller timing chain and sprockets from Police 360
Dual-snorkel air cleaner with fresh air ducts
Chrome valve covers and air cleaner lid
Street-Hemi style mufflers

EH1 (truck) motor didnt have cat's so they had a better exhaust and 255 HP, up from 245 of E58.