Last I checked my local machine shop wanted something like $20 to machine a piston. I've no idea what it costs to have a custom head gasket made.

wouldnt it be cheaper to get a custom gasket than machine 4 pistons ??

So while going though some more catalogs I noticed that Honda D17 pistons from a 2003 Civic have a pin height of 27mm and a bore size of 75mm. The skirts are also very short and look like they might clear the crank throws. I may order one and test fit it in my A12A block has this set up wouldn't require any machining.

For race classes where one has to use an A12 block this could be an advantage. This would make it possible to get between 1450cc & 1488cc using oversize D17 pistons.

Additionally the dish is such that the static compression would be 10-1

There is one down side, at 27mm the pistons would be .4mm proud of the block. The choice would be use a 1mm thick head gasket which would leave .6mm clearance Nissan Comp gasket is .6mm so that clearance should be fine or mill .4mm of the pistons.

At $12 each from Rockauto (Enginetech #P47984) I likely order one for a test fit sometime over the summer. If I stick with racing the car as a C-sedan this might give a prayer against the 1380cc minis.