Will these 265-283 hedder Hugggers work?

[bsa_bob2]

I saw a set of chrome headers for a 283-265,-350-Whats the difference, i thought all the sbc's were same block all the way back!. As I search for some kind of header [block style] to fit between the 500 steering box and the engine head, i don't know how to do links. So picture is found on google. Am i wrong about this . These appear are shorter smaller...as it appears overall .but could just be my vision going bad. i have to dent in the 2 o/s middle tubes then have them coated? I have the engine Sidemounts and 4-speed. The clutch linkage is killin me. if the kind i found will work . i'll get them Whats your knowledge on this problem?. Never built a set before so thats out, one side -the leftside will miss all the linkage, oil pan, steering box,IT looks like etc.forgive my spelling . thank you much bob s this exhaust thing getting pretty tiresome.