being new to the slant 6 can anyone tell me about the differances between them?

Kern Dog said

There were three slant six displacements. 170, 198 and 225.
They are all decent for transportation but not good for performance. By the time you modify them to run fast, they are too radical for regular driving. A mild 318 will out run a beefed 225 while running smoother and getting better mileage.

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some slant six info at this site
A durability legend with performance upgrades: Mopar slant six engines

I have built a few slants, for me they are fun to work with, mine have good performance and driving capabilities. One item of note: with V8's folks can generally buy performance engine parts from a catalogue or big box performance store, with slants, typically one needs to adapt parts such as pistons, valves from other applications and specify cam shaft grinds as there is not much if any performance slant six parts available across the counter. To me that makes it more interesting.