14's in a 4000 lb car can be done with a rerung 360, 4bbl, headers, comp XE262 and 3.55's. BTDT

if you're not planning on swapping pistons out of the 400, I'd probably look at a voodoo 60302 or a comp XE262.

1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)