I would definitely look at using the 103 Rams heads if the comp numbers crunch OK.I always thought the 110 heads were an unusual choice for the factory build.Keeping the original 110 pistons would make a cheap build.I'm sure the Rams heads already have suitable springs for the 259's ?
I have a nice new set of 113 CP pistons on the shelf 😮Also a very nice set of WFO larry stage 2+ heads looking a bit lonely !