Part# 0-80459SA holley spread bore 750cfm carb.would be a good fit for stock or mild build.Keep the 3:89's if you want to add a mild cam look at the Comp Cams Dual Energy cam 275DEH 2000 - 6000 RPM range.
Had one of those moments the other day couple of guys stopped to look at my mach 1 and one mentioned he was building a ford truck . He put a boss 302 from a 1976 mustang and a 4 speed powerglide trany in it. I stopped myself from busting out laughing and told him i really wanted to see this...
Out of the roughly 7 pages of the registry on this site the 73's are out in front so far 73 = 48 , 72 = 39 , 71 = 45 granted all members have not registered there yet , but it is a starting point . Probably a long way to go as well though