Just as a side note here, on the 632 Chevy, I ported several sets of heads for those 20 years ago that flowed 490/340 to 538/360cfm, on the exhaust with 2.400-2.450/1.940 valves. Made 1213 hp with two dominators and sheetmetal intake. I have found over the years that the more cubic inches you have, you can't get the ports too big. For a FE to be competitive at that level, it needs comparable flow capabilities. The Victor can be ported to flow over 500 cfm, but the best heads right now are still limited at, or near 400-410cfm. It is going to take a huge increase in flow potential to reach 490cfm with the FE design and still look like a FE from the outside. The valve arrangement is not the problem, it is the dogleg and short turn that need to be completely revised. Barry's head intake port shape is getting close, just needs a much higher short turn. I really like the idea of a block that is capable of 4.600 bore, in the stock appearing architecture. JMO, but hope you can make it happen. Joe-JDC