Hydraulic Roller Lifters

360duster said
the 1977 318 block is not set up for the roller lifters from the later LA-engines. As far as i know you can´t use this lifters in this block. And you can´t use a flat tappet cam with this roller lifters, should be a "roller cam" with different lobe profiles.

What he said. You need to get a "retrofit" roller cam set up for a '77 block. This is because the older blocks have shallower lifter bores and the older blocks don't have the mounting bosses to hold the bracket that keeps the lifters located.

Also cam must be ground for roller lifters to work correctly. You can't run a flat tappet cam with roller lifters.