A Edelbrock RPM regular or Air-Gap. I'd rather the Air-Gap.
You can call Jegs or Mancini racing up direct for these pistons and the rest of the parts. You'll need the block looked at and machined first before you purchase anything. Things like overbore sizes and size bearings if the crank needs to be cut.
I have not used sealed power anything myself. But they have a good rep. here. I have used the clevite series alot.
Theres also no need to purchase rods over the stock ones unless there bent and messed up. Then reworking the rods can be expensive as to a purchase of new rods for the pistons.
Your going to have to do a search for a engine builder in your area. Even if it means a decent little drive to get there. Where is DLI to you?
Make a post. Engine builder needed in your area. Theres lots of Cali. fellas here.