'69 225 into a Valiant with a 170

You have an oil pan , the flywheel center hole can be machined to the proper diameter easily. The bolt pattern on the early and late 6 cyl cranks are the same .Pilot bushing is an auto parts store item for under 10 bucks. I say go for it.I had one with a machined hole in the flywheel in my 65 Barracuda 30 years ago. it was a 72 motor. It all worked just fine