Re: Beginning frame off '70 Chevelle
I can tell you this, neither the most expensive or the least expensive repop metal is worth the money. Find a donor. You'll be better off in the long run. And you'll save all the shipping costs from not having to ship those repop parts back to the supplier.
When I was looking for metal for my Elky, I contacted Desert Valley Auto Parts in Phoenix. They had everything I needed and it fit the first time.
If you insist in buying repop metal, some people have said you'll be more likely to get pieces to match up, fit right, if you buy multiple panels from the same manufacturer/supplier. Don't know, I've never tried that.
I'm the guy who goes out and buys lots of repop metal, just to discover that it doesn't fit. Then searches for months to find the same used OE panels.
Good luck with you frame off restoration.
1972 El Camino SS (sold)
1981 Camaro Z28
2005 Silverado 3500 LS
2013 Sierra 1500 SLT