Reading Ted's head's thread's, there is only one reason I would buy new heads. My ECZ-G's gave up the ghost and I couldn't find another ECZ-G or 5752-113 set to port. Given that:
1) As the restorer on a budget, I'd want a 100% authentic looking, 100% backward attachment compatible, 100% performance optimized, durable-as-dirt cast iron, posted, ECZ-G type casting, hardened seats, sbc 2.02" intakes, sbc 1.60" exhausts, sbc valve guide seals, sbc valve guide boss OD's, sbc valve spring shim compatible, 0.600" valve lift capable, flows as good as John Mummert's race port (so I don't have to port them myself), available in 69, 72 & 82cc's, starting with 69cc's.
2) As the racer with deep pockets, I'd want heads as mean as the best of the best sbf's, aluminum naturally, 100% sbf intake compatible giving full access to best air and fuel intake combinations sbf owners enjoy - even fuel injection), optimized to the Y-block's smaller cylinder diameter, in a variety of combustion volumes from pump gas to blowers.
Either option offers more rpm breathing potential than a stock Y-block bottom end can safely handle. To fully tap that, in addition to head cost, one would need to upgrade the intake manifold (either find and port an ECZ-9425-B or invest in a Blue Thunder), carburetor (600 cfm or better), fuel pump (1/4" NPT in/out), fuel line (3/8"), fuel tank (1/4" NPT out), oil pump, oil pump drive, connecting rods, pistons, rebalance the crank, upgrade the cam, lifters, push rods, rocker arms if 1.43's, valve springs, retainers, locks, harmonic balancer, add a skirt brace + + + .... 312 owners might even consider a stronger 292 block to drop their crank in. Then there is the vintage drive train. Neither vintage Ford-o-matics or standard manual 3 speeds are up to what these heads can dish out.
Count me as an option 1) 69 cc head buyer
Jerome