Purchasing a floor pan.

The AMD parts always fit very well. I replaced both front pans in my 67 Valiant with AMD pans. The worst part of the job was cutting out the OEM spot welds. I used a rotobroach from Blair. It made the job much easier, but it still took most of a weekend to get the originals out. Another time saving tool for installing the new ones is a hand held pneumatic hole punch like this: https://www.amazon.com/dp/B007QV7WW0/?tag=joeychgo-20

If you aren't a really experienced welder, you should practice doing rosette welds a bit before you burn in the new parts. But by the time you're done, you will be an expert at rosette welds!