That is all good information, thank you.
I hadn't considered using an oil pan as a guide, but the engine mounting bolts were all still tight when I removed the engine. I plan to reuse those bolts.
As for welding the reinforcement, what I did is leave the rails bolted in place and tack the reinforcement in place (with a c clamp on each end of the reinforcement, holding it to each rail). After that, I plan to remove the entire thing from the frame, and finish welding it on a welding table. It is pretty thick steel, so I'm hoping it will not be prone to warping like thinner sheet metal can be. To play it safe, I will likely keep my welds fairly short and allow adequate cooling time between welds.
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