ditch the idea of the Edlebrock 3x2 if you want performance.. not only are they hard to get ( the offenhauser is more common ) they don't do anything for performance except make the throttle response a little snappier..

depending on which engine you have will depend on which performance parts you should buy ( yes, there available )
if it's a 200, then get Ford 2.3 HSC pistions, these are flat tops, and will run at 0 deck.
if it's a 250 then get Ford 255 V8 pistions, there flat tops, but pistion will still be in the hole
get a classic inlines alloy cylinder head and matching intake of your choice.. have mike finish it to 55cc specs and then have it milled .045 bringing it to approxamently 52cc ( stock '65-'68 cyl heads are 52cc )
mild cam of your choice and all buttoned up should maintain about a 9:1 compression ratio but have around 200 HP and gobs of torque figuring a 200.. if a 250, then around 8.5:1 and comparable HP with more torque

www.classicinlines.com can get any performance part you could want