Help with piston ID

I came across a set of pistons for an MGB that were only used for a short while. I don't have any info on them, so maybe someone here can help ID what I've got.

They do have AE cast inside, so I'm assuming they are cast. How can I tell? They are flat tops with full floating pins and circlips. The diameter I measure at the bottom of the skirt is 3.274", ninety degrees from the pin. They also have a compression height of 1.536". My JE's have a compression height of 1.680" which is pretty close to zero deck with an unmilled block. I'm pretty sure I can mill .140" off the block to get to zero deck for as much compression as I can get.

Basically, are these pistons worth using, or should I stay away?

Thanks, John

If they're full floating they're for the 1968-1974 engines. But stock diameter is 3.160 so those would be .110" oversize. That means they're from a set that would make your engine 1930cc. If it's flat top and you take the deck down to the piston crown and you have that much overbore, you're going to have a lot of compression - but not necessarily efficient squish areas. I'd be careful. Basil