Engine comparasion and rebuild help

[AceD909]

Can someone help me compare these engines and identify the differences: BAM, AGU, AYP, AJQ, AUQ.

I currently have a BAM engine. Can I use BAM internals with any of these engines to create a more powerful engine reaching 250hp?

I am looking to replace my BAM engine because it's not performing well.

For the rebuild, I plan to use:
- BAM Block, Pistons, and Rods due to the 9.0:1 compression ratio.
- New bearings and rings.

There is an engine for sale with a rebuilt head, recently changed timing chain and tensioner, timing belt, and tensioners. However, I don't know the engine code, and I was told it was one of the ones I mentioned.

 

[MoToJoJo]

I'm not really a petrol engine guy but I don't think there's much difference between any of the engines (apart from AUQ which has 19mm rather than 20mm wrist pins).

Problem with buying an engine with rebuilt head etc is you need receipts etc frrom companies you trust otherwise it's a gamble (if you've ever watched M539 on YouTube, you'll know why)