225 long rod stroker, HELP

I've been told that can be done by flipping the rod/piston 180* in the block.

This right here illustrates the problem of trying to build a motor based on bits and snippets of information picked up, sorta, from posts made by people who almost think they kinda remember hearing somebody say something about having read a thing in a book back around 1975 or so.

The rods go the right way round in the engine. If not, you create oiling problems for yourself.

The pistons go the right way round on the rods if you want the engine quiet. If you want to fractionally reduce friction, you can turn the pistons 180°, but then prepare for the engine to sound like it's going to think about chucking a rod until it warms up…every time.

My biggest interest in the long rod is closing the combustion area to increase compression.

Wrong tool for the job.

The money spent on decking the block, shaving the head

…is money you're going to spend anyhow, long rods or no long rods, to get the surfaces flat and the combustion chamber volume where you want it.

The total project with motor, I don't want to exceed 8-10k

Spend wisely and that's doable.