454 is a Gen 5 block: 4 bolt mains. No provision for mech. fuel pump. One piece rear main seal. This one have retrofit Hydraulic Rollers and a timing cover with a cam plate. Regular Stock Passenger Heads... Single Plain w. Edelbrock 750...for now...some kind of EFI later. Cam: (It's a Truck!) Looking for a Bottom End to Mid range Gobs of Torque Stick. Gen 4 - Hydraulic Roller. ...With a nice sound...not as important!... Any Ideas / Experience?