273 build ?????

I am in the same predicament. I have a 273 that is being rebuilt. It has the TRW l2222n .030 over pistons in it (from a previous rebuild ). These, I suppose, have 10.5:1 compression like the stock 273 commando did. I want a milder compression ratio for pump gas.
(a)Does anyone know the amount to take off these piston domes to get a good 9.?:1 c.r?
(b)What value do these l2222n pistons have if I sold them and ordered from the above mentioned companies?
(c)Where do I get light wrist pins for the connecting rods (the ones on here are hemi strength but heavy)?
What other mods will help make a dependable yet spunky 273 for me?