Putting a Solid cam in a Hydraulic Block??
You probably allready know this Brambles but you'll need a new solid lifter cam for those solid lifters. That being said you shouldn't have to do anything special to the block so that it'll accept the lifters as long as the lifter to bore clearances are correct. You'll obviously need adjustable rocker arms and cup/ball push rods not the ball/ball rods used on the stock engine. I'm sure several of the members can tell you the perfect combo to use especially the cam choice. List your entire power train (engine internals, tranny, converter, rear end and ratio) to help the process.
Terry