Found a 230 flat head with a 2 speed auto trans from a 55 Plymouth for sale nearby and the seller wants $300 for the pair. I'm considering going to look at it all this weekend. I figured for the price, I would have a back up motor, should I have problem from my original one. The other option is to build the newer one, ( split manifolds, dual carbs, etc), while I drive my stocker. Will the 55 model 230 have more power stock than my 48 model? I'm thinking the compression may have gone up some between the years. Accelerator linkage may be different, but can be worked out. In regards to the 2 speed trans, are they worth having, or, of any value to sell? Would it have the park brake on the trans also? How hard would it be to use it in my 48, (which now has fluid drive), if I decided to go automatic? At the prices I've seen for used 230 parts, (exhaust manifolds, etc), I figure it's at least worth checking out! Give me your thoughts on this!!