Distributor

Factory electronic. Cheap, plentiful and small diameter/ height. You can easily modify the mechanical and vacuum advance curves to whatever you want and can use to run the factory electronic box or any aftermarket (msd) box.

IMO aftermarket distributors are one of those things people spend good money on that really do nothing for performance or reliability. Often they need just as much, or more work and tweaking to tailor them to your engine as a factory distributor would.