Do yourself a favor and buy the moulded pad opposed to the "floppy". They are $80 vs. $20 but WELL worth the difference. I've had both and can tell you first hand the soft one sucks (lasted one day). I have pics on my photobucket web page click on the link below...
I have them on my Camaros and My GTO...before molded pads were available I had the soft pads on my 69 SS and 69 Z...both pads held up well but did not look nearly as good as the molded pad.
Still am not clear on whether or not the molded pad came on a 400 hood or a standard hood with V-8. would it look wrong?
I don't believe there were any molded pads at all on GM cars in the 60's. So, it wouldn't be original looking..... Whether that is bad or not....you decide.