Rowen: You wrote in a previous thread from Kahuna that you were using a Ford 'E' code intake manifold on the 312 that you're assembling.
I don't know what you purchased from Larry's in the way of a valley pan, BUT... be careful. It is AMAZING the number of Ford 'E' code intake manifolds I've seen advertised on eBay that have had the front 'ears' repaired by welding. I suspect that the welding has been necessitated by a previous owner THINKING that they could install the Ford 'E' manifold using a usual FoMoCo y-block valley pan. It does NOT work.
An alternative to the pricey original Ford 2x4 valley pans or their reproduction counterparts is a piece of flat steel sheet stock. This is what Ford used on the '56 Ford over-the-counter Power Pack kits. Something made from ~10 gauge steel stock should work. Another approach might be one of Charlie Price's Vintage Speed cast aluminum flat valley pans for the y-block or perhaps John and Geoff Mummert's valley pan offering would work. John can tell you, I'm sure.
Whatever you use, be sure of your clearance before torquing your Ford 2x4 intake down. Trust me on this!
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York