198's can be worthwhile only if you have some crazy dude willing to get or pull the parts. Most of them are not worth anything except to the 10-20 guys left on earth who are interested in building such things.
No young people are into these engines, just greyhairs or no hairs, because they take work to do anything with.
I just picked up 2 cranks and 1 set of rods in Ohio - ~5 Hours one way from here along with a complete long block and 2 904's for my buddy. I have to be careful now not to collect too many things. Good thing you are not closer to me!
@Darter6 I have a fresh, nice , not cracked, free flapper valve, no broken exhaust studs exhaust manifold that I just pulled off a '79 Volare. Send me a message if you want it. We can work something out.