Thanks for the info mate , for a second I thought you'd left the planet. I don't have a spider or dog bones. Just couldn't understand why you would change a roller engine into a non roller , but quite happy to leave it a non roller but thought that CR296H might be too big for a 56 f100 cruiser. So where will I find the right part numbers for the heads ?
Nope, still here and still annoying as ever.
Who knows why some people do things.
Yes, 1956 F100 truck AND the word "cruiser", suggest to me that you really do not want that 296 cam and do not need a roller and that the xe274h cam is the biggest you need and if you don't plan to rev it very often to the max rpm of around 5800 that the xe274h will give you, then the xe268h or a similar cam will suit your goals AND your pocket book far better.
In your case, depending on the heads, I would prefer a little more lift with the xe268h cam but this means that you may need new rockers unless it already has rockers that have a higher ratio than the stock ones, but howards or lunati may have a similar cam to the xe268h that has a bit more lift if your rockers are stock.
The cam shaunp suggested is also an xlnt cam, as is everything he suggests, but if it's a roller type, it is probably a tiny bit more of a cam than you need or will use, plus, keep in mind that he and that glenn guy
are tire burners, so no cam is really too big for them.
As far as figuring out what the part number is for the heads, I don't know but may be able to find out.
Where did he order them from?
Also, unless you plan to roast the tires much off the line, I would use a smaller converter like 2500 max as shaunp inferred.