Honestly- stick to your plan.
I’d prefer the 273 but your 225 is ready to go. When the wife wants to do burn outs then invest in that.
Look up autobodyspecialts in Middlefield, CT. They have the floor pans for 63-66 early a bodies. Heck even the 67-76 will work with some massaging and a die grinder. Unless you’re going for concourse resto, nobody will know. 90percent of the people would even look under the car.
If you are like me then you do it 100% even when body is looking. lol.
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