One concern you might consider in your selection is finding off the shelf headers that fit for the Trick Flows, unless of course money isn't an issue. I've got a set of these heads on my 351w in a '67 mustang and I couldn't find affordable headers---ended up drastically modifying a set of 1 3/4" swap Hookers. Also, with the exhaust ports so high, I've had some header flange to valve cover clearance issues even using double gaskets.