headers for 69 c10

[lane620]

I found these headers on craigslist an was wondering if anyone has installed them on an 69 c10 with a 454.this is what they say.....Will fit only if the original GM big block engine frame mounts from the following applications are used: 1970-72 Camaro, 1965-74 Corvette, or 1968-72 Chevelle.I had read some where that Chevelle headers would work but I'm reluctant to buy them without more input.thanks in advance.oh they are flowtech 31130.