[agnes the dog]

I used a set of Hedman headers from a 73-87 Chevy truck. Worked without any modification at all. I have a 1984 305 SBC in a 59 stepside with original steering. Not sure what you mean by the tubular crossmember though. I have the original bellhousing style rear mounts. I can't see how the front mounts could ever come into play. I'll take some pics later to show how it looks.