I have built several 250's, and what you're proposing is simply to make a 250 out of your 194. The 250 piston comes to within a few thousandths of the top of the block already, so there's simply no room to increase the stroke any further. 307 V-8 pistons are flat-topped, not dished like the 250 piston, and they are a drop-in swap. I have milled a 250 head .050", plus installed the 307 flat tops, and we were still able to run 87 octane gas. That gives a compression ratio of about 9.5:1, which is simpler, and much easier than trying to cobble together some oddball mix of parts that cannot work in the first place.
Jerry

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