1975 - 360 heads
Milling the block is not what I would recomend in getting the stock pistons to be at zero deck but would rather point out Keith Black has a set of pistons to be at or near zero deck. From there I would mill the block to achieve a zero deck piston. If these are the pistons you have, then go ahead with the plan.
IMO, Hell no! If you have a set, sell'em and roll the money over into something else on the car/engine. Leave'em stock for best money on resale.
Only if your racing for big dollors and have to use iron heads.
To much. Not a good bang for the buck.
IMO, that would be a bad move. You could use the smaller valve to keep torque up and live without the few HP up top. You'll probably ET better with the smaller valve and be 1 or 2 mph behind the larger valve at worst.
Oh bummer. I was enjoying our little chats. Bug away anytime. No problem so long as your picking up on what were all saying.