You already have all stock components, I have a stock distributor you can use and convert it. A caveat to HEI is the clearance between firewall and cap. It's not pretty and you may (likely) have to push back the firewall.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.