a roller cam small block....a standard LA block will not accept a 85-92 Roller Cam without the roller cam lifter galley and valvetrain of a Roller Block.
A Magnum Headed Standard LA Small Block, is just that.
A LA Roller Cam 318/360 with Magnum heads is different only by the Roller Cam.
Don't worry though...Chrysler 5th Avenues are damn near *free* these days...they have LA Roller 318's with 302' heads...as long as the engine is factory OEM Black.