Hughes Roller rockers or my current?

Those pistons look to be for the earlier 318 poly. Not any higher compression that a lot of other 318 pistons.

Not sure those pistons are really forged..... whoever wrote the eBay listing may not really know. The TRW forged piston PN's that I used always started with 'L'. Here is a bit of info: trw piston question. forged or cast? - Chevelle Tech

Obviously, the forged piston is going to be more likely to survive with the nitrous.